# Use simple additive strategies with whole numbers and fractions

Use simple additive strategies with whole numbers and fractions

1. | Changing Numbers: 27 to 29 | |

2. | Changing Numbers: 90 to 85 | |

3. | 5 less, 5 more than 80 | |

4. | 5 less, 5 more than 30 | |

5. | Changing Numbers: 85 to 80 | |

6. | Changing Numbers: 45 to 50 | |

7. | Changing Numbers: 85 to 80 | |

8. | Changing Numbers: 48 to 50 | |

9. | Back to School: 5c + 15c + 7 c | |

10. | Make 20: 7+4+? | |

11. | Make 20: 11+5+? | |

12. | Make 20: 8+9+? | |

13. | Add these 3 numbers: 14 + 5 + 2 | |

14. | Add these 3 numbers: 11 + 4 + 5 | |

15. | Add these 3 numbers: 9+10+4 | |

16. | Add these 3 numbers: 13 + 7 + 6 | |

17. | Number Detectives: 10 + ? = 34 | |

18. | 100 Grid: Start at 15. Add 7 | |

19. | 100 Grid: Start at 28. Add 8 | |

20. | 100 Grid: Start at 14. What is 11 more? | |

21. | 100 grid: 11 more than 33 | |

22. | 100 grid: Find 9 more than 27 | |

23. | True or False?: 21 + 4 = 25 | |

24. | True or False?: 26 + 3 = 29 | |

25. | True or False?: 22 + 6 = 28 | |

26. | Make 50: 20+10+? | |

27. | Make 50: 20+10+? | |

28. | Make 50: 20+10+? | |

29. | Make 50: 20+10+? | |

30. | Make 50: 20+10+? | |

31. | Adding tens: 26 + ? = 36 | |

32. | Adding tens: 46 + ? = 56 | |

33. | Adding tens: 64 + ? = 94 | |

34. | Adding tens: 38 + 20 = ? | |

35. | Adding tens: 56 + 30 = ? | |

36. | Adding tens: ?+ 36 = 66 | |

37. | Adding tens: ?+ 73 = 83 | |

38. | Adding tens: ?+ 46 = 86 | |

39. | Now Add This! 34+11, 34+12 | |

40. | Now Add This! 19+20, 19+24 | |

41. | Now Add This! 26+21, 26+31 | |

42. | Now Add This! 52+20, 52+17 | |

43. | Now Add This! 33+19, 33+21 | |

44. | Addition Chains | |

45. | Changing numbers 136 to 140 | |

46. | Changing numbers 122 to 130 | |

47. | Changing numbers 154 to 160 | |

48. | Changing numbers 188 to 190 | |

49. | Changing numbers 177 to 180 | |

50. | Add three numbers: 4 + 8 + 7 | |

51. | Add three numbers: 6 + 7 + 9 | |

52. | Add three numbers: 14 + 7 + 3 | |

53. | Add three numbers: 10 + 12 + 8 | |

54. | Add three numbers: 13 + 9 + 7 | |

55. | Add three numbers: 20 + 10 + 20 | |

56. | 40s zone: Add on 5 to 36. | |

57. | 40s zone: 4 more than 38 | |

58. | 40s zone: 37 plus 5 | |

59. | 40s zone: 4 more than 39 | |

60. | 40s zone: Add on 3 to 38 | |

61. | 50s zone: Add on 5 to 47. | |

62. | 50s zone: 49 plus 3 | |

63. | 50s zone: 48 plus 5 | |

64. | 50s zone: 4 more than 47 | |

65. | 50s zone: 5 more than 46 | |

66. | Bob's and Kai-ling's teams $16 + $7 = $? | |

67. | True or False?: 42 + 7 = 49 | |

68. | Same or Different: Click all the boxes with the answer 25. | |

69. | Same or Different: Click all the boxes with the answer 37. | |

70. | Same or Different: Click all the boxes with the answer 34. | |

71. | Same or Different: Click all the boxes with the answer 26. | |

72. | Same or Different: Click all the boxes with the answer 28. | |

73. | Make 30: 10 + 11 + ? = 30 | |

74. | Make 50: 20+10+? | |

75. | Make 30: 19 + 2 + ? = 30 | |

76. | Make 30: 20 + 10 + ? = 30 | |

77. | Make 30: 16 + 4 + ? = 30 | |

78. | Make 30: 20 + 7 + ? = 30 | |

79. | Make 30: 18 + 3 + ? = 30 | |

80. | 100 grid: Start at 73. Add 7. | |

81. | 100 grid: Start at 45. Add 8. | |

82. | 100 grid: Start at 26. Add 5. | |

83. | 100 grid: Start at 68. Add 4. | |

84. | 100 grid: Start at 52. Add 7. | |

85. | Adding tens: 120 + ? = 140; 120 + 50 = ? | |

86. | Adding tens: 24 + ? = 64, 24 + 50 = ? | |

87. | Adding tens: 145 + ? = 155, 145 + 30 = ? | |

88. | Adding tens: 57 + ? = 97, 57 + 20 = ? | |

89. | Adding tens: 138 + ? = 178, 178 + 20 = ? | |

90. | Three Up!: Add 3 to 60, 20, 50 | |

91. | Two Up!!: Add 2 to 23, 15, 37 | |

92. | Two Up!!: Add 2 to 29, 80, 12 | |

93. | Two Up!!: Add 2 to 14, 24, 44 | |

94. | One Up!: Add 1 to 65, 19, 42 | |

95. | Changing numbers: 24 changes to 33 | |

96. | Changing numbers: 19 changes to 28 | |

97. | Number Detectives: ? + 7 = 30 | |

98. | Number Detectives: ? + 24 = 30 | |

99. | Number Detectives: 24 + 6 = ? | |

100. | Number Detectives: 5 + 25 = ? | |

101. | Number Detectives: 22 + ? = 30 | |

102. | Number Detectives: 21 + ? = 30 | |

103. | Use the pattern: 2+4, 12+4, 120 + 40 | |

104. | Use the pattern: 4+1, 14+1, 140+10 | |

105. | Use The Pattern: 4+3, 14+3, 140+30 | |

106. | Use The Pattern: 2+7, 12+7, 120+70 | |

107. | Use The Pattern: 5+4, 15+4, 150+40 | |

108. | Use The Pattern: 3+6, 13+6, 130+60 | |

109. | Use The Pattern: 5+3, 15+3, 150+30 | |

110. | Make 50: 40 + 4 + ? | |

111. | Make 36: 20 + 14 + ? | |

112. | Make 39: 30 + 6 + ? | |

113. | Make 37: 12 + 20 + 5 | |

114. | Make 34: 10 + 22 + ? | |

115. | Beyond 20: What is 6 more than 29? | |

116. | Beyond 50: What is 4 more than 57? | |

117. | Beyond 70: What is 8 more than 78? | |

118. | Beyond 30: What is 4 more than 38? | |

119. | Beyond 60: What is 5 more than 68? | |

120. | Number detectives: 30+?, 50+?, 60+? =100 | |

121. | Number detectives: 80+?, 90+?, 40+?=100 | |

122. | Number detectives: 10+?, 70+?, 50+?=100 | |

123. | Number detectives: 25+?, 35+?, 55+? =100 | |

124. | Number detectives: 5+?, 45+?, 15+?=100 | |

125. | Add on tens: Add 10, 20 to 35 | |

126. | Add on tens: Add 10, 20 to 16. | |

127. | Add on tens: Add 10, 20 to 36 | |

128. | Thinking in tens: Add 10, 19 to 19 | |

129. | Thinking in tens: Add 10, 11 to 14 | |

130. | Add three numbers: 2 + 13 + 9 | |

131. | Add three numbers: 15 + 7 + 8 | |

132. | Add three numbers: 14 + 12 + 8 | |

133. | Add three numbers: 17 + 7 + 12 | |

134. | Add three numbers: 11 + 14 + 5 | |

135. | Number detectives: ? + 9 = 49 | |

136. | Number detectives: ? + 11 = 53 | |

137. | Crossing 100: 4 more than 99 | |

138. | Crossing 100: 7 more than 97 | |

139. | Crossing 100: 8 more than 98 | |

140. | Crossing 100: 9 more than 92 | |

141. | Crossing 100: 5 more than 97 | |

142. | True or False: 12+14=26 | |

143. | True or False: 12+12=24 | |

144. | True or False: 15+12=27 | |

145. | Number detectives: 22+9 = ? | |

146. | Number detectives: 51+11 = ? | |

147. | Number detectives: 35+? = 46 | |

148. | Same or Different: Click all the boxes with the answer 50. | |

149. | Same or Different: Click all the boxes with the answer 46. | |

150. | Same or Different: Click all the boxes with the answer 32. | |

151. | Same or Different: Click all the boxes with the answer 45. | |

152. | Same or Different: Click all the boxes with the answer 38. | |

153. | Make 50: 39+7+? = 50 | |

154. | Make 50: 39+5+? = 50 | |

155. | Make 50: 35+5+? = 50 | |

156. | Make 50: 38+10+? = 50 | |

157. | Make 50: 42+6+? = 50 | |

158. | Beyond 40: 6 more than 45 | |

159. | Beyond 70: 5 more than 79 | |

160. | Beyond 60: 8 more than 68 | |

161. | Beyond 50: 7 more than 58 | |

162. | Beyond 70: 9 more than 72 | |

163. | N/D Mysteries of 40! 34+? 30+? 38+?=40 | |

164. | N/D Mysteries of 40! 31+? 36+? 30+?=40 | |

165. | N/D Mysteries of 40! 33+? 37+? 32+?=40 | |

166. | N/D Mysteries of 40! 32+? 39+? 34+?=40 | |

167. | N/D Mysteries of 40! 31+? 35+? 37+?=40 | |

168. | 100 Zone: 70 + 40 = ? 90 + ? = 110, ? + 80 = 110 | |

169. | 100 Zone: 60 + 80 = ? 90 + ? = 140, ? + 100 = 140 | |

170. | 100 Zone: 70 + 80 = ? 100 + ? = 150, ? + 70 = 150 | |

171. | 100 Zone: 90 + 70 = ? 80 + ? = 160, ? + 60 = 160 | |

172. | 100 Zone: 95+7=? 101-?=99 ?+6=103 | |

173. | 100 Zone: 95+6=? 103-?=99 ?+6=104 | |

174. | 100 Zone: 98+7=? 105-?=98 ?+6=105 | |

175. | 100 Zone: 98+6=? 102-?=98 ?+5=103 | |

176. | 100 Zone: 98+3=? 101-?=97 ?+5=102 | |

177. | Changing Numbers 29 to 34 | |

178. | Changing Numbers 67 to 78 | |

179. | Changing Numbers 98 to 101 | |

180. | Changing Numbers 87 to 92 | |

181. | Changing Numbers 59 to 63 | |

182. | Changing Numbers 96 to 101 | |

183. | Changing Numbers 98 to 105 | |

184. | Changing Numbers 97 to 103 | |

185. | Changing Numbers 97 to 102 | |

186. | Changing Numbers 99 to 103 | |

187. | Changing Numbers 42 to 62 | |

188. | Changing Numbers 63 to 93 | |

189. | Changing Numbers 14 to 54 | |

190. | Changing Numbers 137 to 157 | |

191. | Changing Numbers 35 to 85 | |

192. | Number detectives *+109 = 113 | |

193. | Number detectives *+4 = 103 | |

194. | Number detectives *+5 = 103 | |

195. | Number detectives 235+6 = * | |

196. | Number detectives 98+7=* | |

197. | Number detectives 485+*= 493 | |

198. | Number detectives 515+*= 523 | |

199. | Number detectives 95+*=101 | |

200. | Number detectives 97+*=103 | |

201. | Use The Pattern 3+5 30+50 300+500 | |

202. | Use The Pattern 3+6 30+60 600+300 | |

203. | Use The Pattern 2+4 20+40 200+400 | |

204. | Use The Pattern 3+2 30+20 200+300 | |

205. | Use The Pattern 6+2 60+20 600+200 | |

206. | Make 200: 130+50+* | |

207. | Make 200: 70+100+* | |

208. | Make 200: 60+40+* | |

209. | Make 200: 90+30+* | |

210. | Make 200: 150+40+* | |

211. | The 1 Family - Add 1, add 11 to 35 | |

212. | The 1 Family - Add 1, add 11 to 27 | |

213. | The 1 Family - Add 1, add 11 to 49 | |

214. | The 1 Family - Add 1, add 11 to 57 | |

215. | The 1 Family - Add 1, add 11 to 83 | |

216. | Addition Chains 21 + 3 + 6 + 5, 60 + 4 + 3 + 2 | |

217. | Addition Chains 33 + 4 + 10 + 5, 28 + 3 + 9 + 8 | |

218. | Addition Chains 23 + 5 + 4 + 9, 60 + 8 + 3 + 10 | |

219. | Addition Chains 95 + 4 + 2 + 12, 94 + 3 + 3 + 7 | |

220. | Addition Chains 100 + 5 + 5 + 7, 99 + 3 + 6 + 2 | |

221. | Beyond 90: 98 + 4 | |

222. | Beyond 100: 104 + 7 | |

223. | Beyond 110: 119+3 | |

224. | Beyond 120: 128+6 | |

225. | Beyond 130: 139 + 5 | |

226. | Changing numbers: 12 + 10, +11, +111 | |

227. | Changing numbers: 28 + 10, +11, +111 | |

228. | Changing numbers: 49 + 10, +11, +111 | |

229. | Changing numbers: 88 + 10, +11, +111 | |

230. | Changing numbers: 29 + 10, +11, +111 | |

231. | Number Detectives: 100 Pairs ? + 79 = 100 | |

232. | Number Detectives: 100 Pairs ? + 51 = 100 | |

233. | Number Detectives: 100 Pairs 63 + 37 = ? | |

234. | Number Detectives: 100 Pairs 88 + ? = 100 | |

235. | Use the pattern: 6+3, 60+30, 600+300 | |

236. | Use the pattern: 2+4, 20+40, 200+400 | |

237. | Use the pattern: 2+6, 20+60, 200+600 | |

238. | Use the pattern: 4+9, 40+90, 400+900 | |

239. | Use the pattern: 1+7, 10+70, 100+700 | |

240. | On the Board 45 + 3* = *7 | |

241. | On the Board 3* + *5 = 98 | |

242. | On the Board 4* + 42 = *9 | |

243. | On the Board 3* + 62 = *6 | |

244. | On the Board 8* + *6 = 98 | |

245. | On the Board 33 + *5 = 7* | |

246. | On the Board *8 + 51 = 7* | |

247. | Adding Tens 167 + * = 197 | |

248. | Add Hundreds: 600+ * = 946 | |

249. | Add Hundreds: 200+ * = 580 | |

250. | Add Hundreds: 400+ * = 963 | |

251. | Add Hundreds: 100+ * = 319 | |

252. | Add Hundreds: 300+ * = 565 | |

253. | Adding Tens: 416 + 50 = * | |

254. | Adding Tens: 542 + 50 = * | |

255. | Add Hundreds: 500+246 | |

256. | Add Hundreds: 300+453 | |

257. | Add Hundreds: 200+43 | |

258. | Add Hundreds: 800+163 | |

259. | Adding Tens: * + 726 = 786 | |

260. | Adding Tens: * + 314 = 394 | |

261. | Add Hundreds: * + 300 = 330 | |

262. | Add Hundreds: * + 200 = 241 | |

263. | Add Hundreds: * + 800 = 819 | |

264. | Add Hundreds: * + 300 = 345 | |

265. | Add Hundreds: * + 200 = 295 | |

266. | Number Detectives: 100 Pairs 85 + ?, 75 + ?, 45 +?= 100 | |

267. | The Nine Family: 53 + 9, + 19 + 29 | |

268. | The Nine Family: 47 + 9, + 19 + 29 | |

269. | The Nine Family: 38 + 9, + 19 + 29 | |

270. | The Nine Family: 55 + 9, + 19, + 29 | |

271. | The Nine Family: 42 + 9, + 19, + 29 | |

272. | Mysteries of 30!: 20+?, 15+?, 5+? | |

273. | Mysteries of 30!: 19+?, 10+?, 16+? | |

274. | Mysteries of 30!: 12+?, 13+?, 14+? | |

275. | Mysteries of 30!: 9+?, 5+?, 7+? | |

276. | Mysteries of 30!: 26+?, 28+?, 22+? | |

277. | Number detectives: 102+98=? | |

278. | Number detectives: 56+92=? | |

279. | Number detectives: 201+99=? | |

280. | Same or Different: Answer 62 | |

281. | Same or Different: Answer 66 | |

282. | Same or Different: Answer 73 | |

283. | Hundreds and hundreds: ?64+5?9=90? | |

284. | Hundreds and hundreds: 364+235=? | |

285. | Number detectives: 30+?, 20+?, 10+?=100 | |

286. | Number detectives: 60+?, 50+?, 75+?=100 | |

287. | Number detectives: 65+?, 55+?, 85+?=100 | |

288. | Number detectives: 82+?, 24+?, 76+?=100 | |

289. | Number detectives: 89+?, 21+?, 59+?=100 | |

290. | Write the missing number: 15 + 1 + ? = 20 | |

291. | Write the missing number: ? + 11 + 2 = 20 | |

292. | Write the missing number: 3 + 4 + ? = 20 | |

293. | Write the missing number: ? + 5 + 6 = 20 | |

294. | Write the missing number: 5 + 8 + ? = 20 | |

295. | Word Wise: Subtract 14 from 20 | |

296. | Word Wise: 20 take away 11 | |

297. | Word Wise: 11 less than 19 | |

298. | Word Wise: 13 less than 20 | |

299. | Write the missing number: 4 + 8 + ? = 20 | |

300. | Write the missing number: 11 + ? + 2 = 20 | |

301. | Write the missing number: ? + 13 + 4 = 20 | |

302. | Write the missing number: 6 + 9 + ? = 20 | |

303. | Write the missing number: 4 + ? + 6 = 20 | |

304. | Taking Tens: 90 - ? = 70 | |

305. | Take 10: ? - 10 = 60 | |

306. | Taking tens: 40 - 30 = ? | |

307. | Taking tens: 50 - 20 = ? | |

308. | Taking tens: 80 - 40 = ? | |

309. | Taking tens: 70 - 10 = ? | |

310. | Taking tens: 70 - 40 = ? | |

311. | Taking tens: 40 - 30 = ? | |

312. | Put in the missing number: 5 + 4 + ? = 16 | |

313. | Put in the missing number: 11 + ? + 6 = 25 | |

314. | Write in the missing number: ? + 13 + 5 = 21 | |

315. | Put in the missing number: 9 + 2 + ? = 19 | |

316. | Put in the missing number: ? + 10 + 14 = 28 | |

317. | True or False?: 27 - 4 = 23 | |

318. | True or False?: 25 - 5 = 20 | |

319. | Subtraction Chain - 22-4=?-3=15 | |

320. | Subtraction Chain - ?-8=16-2=14 | |

321. | Subtraction Chain - 27-20-13 | |

322. | Subtraction Chain - ?-4=21-2=19 | |

323. | Subtraction Chain - 27-4=?-6=17 | |

324. | Subtraction Chain - ?-4=19-3=16 | |

325. | Subtraction Chain - 28-7=21-5=? | |

326. | Use the pattern: 10, 20 & 80 - 5 = ? | |

327. | Use the pattern: 10, 20 & 40 - 3 = ? | |

328. | Use the pattern: 10, 20 & 90 - 7 = ? | |

329. | Use the pattern: 10, 20 & 50 - 4 = ? | |

330. | Use the pattern: 10, 20 & 30 - 8 = ? | |

331. | Subtract from 100: 100 - 30, 40 & 20 | |

332. | Subtract from 100: 100 - 20, 30 & 70 | |

333. | Subtract from 100: 100 - 70, 20 & 40 | |

334. | Subtract from 100: 100 - 40, 90 & 50 | |

335. | Subtract from 100: 100 - 60, 20 & 100 | |

336. | Mysteries of Fifty: 50-?=42, 50-?=45 | |

337. | Mysteries of Fifty: 50-?=48, 50-?=43 | |

338. | Mysteries of Fifty: 50-?=44, 50-?=47 | |

339. | Mysteries of Forty: 40-?=36, 40-?=31 | |

340. | Mysteries of Forty: 40-?=33, 40-?=39 | |

341. | Mysteries of Forty: 40-?=35, 40-?=38 | |

342. | Mysteries of Thirty: 30-?=29, 30-?=24 | |

343. | Mysteries of Thirty: 30-?=21, 30-?=27 | |

344. | Mysteries of Thirty: 30-?=26, 30-?=22 | |

345. | True or False?: 23 - 5 = 18 | |

346. | True or False?: 26 - 13 = 13 | |

347. | Use the pattern 16-4=? 26-3=?, 36-4=? | |

348. | Use the pattern 14-3=? 24-3=?, 34-3=? | |

349. | Use the pattern 15-3=? 25-3=?, 35-3=? | |

350. | Use the pattern 18-5=? 28-5=?, 38-5=? | |

351. | Use the pattern 16-7=? 26-7=?, 36-7=? | |

352. | Use the pattern 13-6=? 23-6=?, 33-6=? | |

353. | Use the pattern 11-5=? 21-5=?, 31-5=? | |

354. | Use the pattern 12-9=? 22-9=?, 32-9=? | |

355. | Use the pattern 19-4=? 29-4=?, 39-4=? | |

356. | Use the pattern 17-8=? 27-8=?, 37-8=? | |

357. | 100 grid: 41 take away 6 | |

358. | 100 grid: 53 subtract 8 | |

359. | 100 grid: 32 take away 5 | |

360. | 100 grid: 76 take away 7 | |

361. | 100 grid: 54 take away 8 | |

362. | 100 grid: 64 take away 9 | |

363. | 100 grid: 84 take away 8 | |

364. | 100 grid: 46 take away 9 | |

365. | 100 grid: 23 take away 7 | |

366. | 100 grid: 71 take away 8 | |

367. | 100 grid: 34 take away 6 | |

368. | 100 grid: 77 take away 9 | |

369. | Subtract from 30: 30 - 20, 7 & 12 | |

370. | Subtract from 30: 30 - 15, 10 & 6 | |

371. | Subtract from 30: 30 - 11, 5 & 21 | |

372. | Subtract from 30: 30 - 8, 30 & 14 | |

373. | Subtract from 30: 30 - 17, 30 & 5 | |

374. | The 9 family: Take 9, 19 & 29 from 57 | |

375. | The 9 family: Take 9, 19 & 29 from 65 | |

376. | The 9 family: Take 9, 19 & 29 from 72 | |

377. | The 9 family: Take 9, 19 & 29 from 44 | |

378. | The 9 family: Take 9, 19 & 29 from 36 | |

379. | Subtract 7 from 24, 22 & 25 | |

380. | Subtract 5 from 21, 20 & 24 | |

381. | Spot the difference between 30 and 15. | |

382. | Spot the difference between 12 and 25. | |

383. | Spot the difference between 30 and 10. | |

384. | Spot the difference between 40 and 10. | |

385. | Spot the difference between 20 and 39. | |

386. | Spot the difference between 18 and 25. | |

387. | Spot the difference between 25 and 34. | |

388. | Spot the difference between 19 and 31. | |

389. | Spot the difference between 19 and 42. | |

390. | Spot the difference between 36 and 15. | |

391. | Same Difference - Difference between 10 and 40. | |

392. | Write the missing number: 20 + 3 + ? = 30 | |

393. | Write the missing number: 12 + ? + 10 = 30 | |

394. | Write the missing number: 15 + ? + 5 = 30 | |

395. | Write the missing number: 9 + ? + 12 = 30 | |

396. | Write the missing number: ? + 5 + 4 = 30 | |

397. | Write the missing number: 15 + ? + 6 = 30 | |

398. | Write the missing number: 18 + ? + 2 = 30 | |

399. | Write the missing number: 20 + 3 + ? = 30 | |

400. | Write the missing number: ? + 13 + 5 = 30 | |

401. | Write the missing number: 14 + 7 + ? = 30 | |

402. | Number detectives: ? + 23 = 30 | |

403. | Number detectives: ? + 18 = 30 | |

404. | True or False?: 30 - 8 = 22 | |

405. | True or False?: 30 - 7 = 23 | |

406. | True or False?: 12 - 2 = 15 - 5 | |

407. | True or False?: 28 - 8 = 30 - 10 | |

408. | True or False?: 15 - 5 = 30 - 20 | |

409. | True or False?: 30 - 5 = 28 - 3 | |

410. | Number detectives: 30 - 14 = ? | |

411. | Number detectives: 30 - ? = 15 | |

412. | Number detectives: 30 - ? = 13 | |

413. | Use the pattern: 9-5, 90-50, 900-500 | |

414. | Use the pattern: 8-5, 80-50, 800-500 | |

415. | Use the pattern: 6-2, 60-20, 600-200 | |

416. | Use the pattern: 9-8, 90-80, 900-800 | |

417. | Use the pattern: 5-3, 50-30, 500-300 | |

418. | Use the pattern: 8-2, 80-20, 800-200 | |

419. | Takeaway board: 3? - 14 = 23 | |

420. | Takeaway board: 2? - 13 = 13 | |

421. | Takeaway board: 4? - 22 = 27 | |

422. | Takeaway board: 6? - 12 = 55 | |

423. | Takeaway board: 5? - 26 = 32 | |

424. | Count Down: 6 less than 41 | |

425. | Count Down: 7 less than 52 | |

426. | Count Down: 3 less than 42 | |

427. | Count Down: 6 less than 43 | |

428. | Count Down: 8 less than 47 | |

429. | Taking Tens: 44 - 20 | |

430. | Taking Tens: 68 - 30 | |

431. | Taking Tens: 98 - 50 | |

432. | Taking Tens: 32 - 20 | |

433. | Taking Tens: 59 - 40 | |

434. | Taking Tens: 87 - 20 | |

435. | Taking Tens: 72 - 40 | |

436. | Subtract.chains 48 - 7 - 2 - 9, 35 - 4 - 3 - 8 | |

437. | Subtract.chains 47 - 4 - 3 - 7, 28 - 8 - 2 - 5 | |

438. | Subtract.chains 23 - 4 - 1 - 3, 36 - 5 - 2 - 6 | |

439. | Subtract.chains 32 - 4 - 7 - 4, 45 - 2 - 10 - 5 | |

440. | Subtract.chains 28 - 5 - 2 - 10, 50 - 5 - 3 - 2 | |

441. | Bargain Basement: $20 - $8 | |

442. | Spot the difference: 60 & 40, 12 & 18, 100 & 95 | |

443. | Spot the difference: 20 & 14, 17 & 9, 80 & 73 | |

444. | Spot the difference: 100 & 30, 19 & 11, 30 & 24 | |

445. | Spot the difference: 50 & 41, 100 & 92, 101 & 98 | |

446. | Changing Numbers 55-37=? | |

447. | Changing Numbers 65-54=? | |

448. | Changing Numbers 48-22=? | |

449. | Changing Numbers 36-16=? | |

450. | Changing Numbers 51-28=? | |

451. | Changing Numbers 42-32=? | |

452. | Write the missing number: 7 + ? + 14 = 30 | |

453. | Write the missing number: 15 + 4 + ? = 30 | |

454. | Write the missing number: 12 + 10 + ? = 30 | |

455. | Write the missing number: 15 + 5 + ? = 30 | |

456. | Write the missing number: 18 + 8 + ? = 30 | |

457. | Write the missing number: 5 + 5 + ? = 30 | |

458. | Number Detectives: ? - 15 = 10 | |

459. | Number Detectives: ? - 9 = 21 | |

460. | Number Detectives: 30 - 17 = ? | |

461. | Number Detectives: 30 - 14 = ? | |

462. | Number Detectives: 30 - ? = 12 | |

463. | Number Detectives: 40 - ? = 29 | |

464. | Takeaway board 152-? = 144 | |

465. | Takeaway board 547-? = 538 | |

466. | Takeaway board 553-? = 546 | |

467. | Takeaway board 291-? 285 | |

468. | Takeaway board 742-? = 737 | |

469. | Takeaway Board ?9-18 = 71 | |

470. | Takeaway Board 67-1?=53 | |

471. | Takeaway Board 79-?8=61 | |

472. | Takeaway Board ?7-17=50 | |

473. | Takeaway Board ?3-21=72 | |

474. | Count down 52-4=? | |

475. | Count down 43-6=? | |

476. | Count down 61-5=? | |

477. | Count down 36-8=? | |

478. | Count down 72-7=? | |

479. | Count down 94-9=? | |

480. | Eleven family: Subtract 1, 11 & 21 from 5 | |

481. | Eleven family: Subtract 1, 11 & 41 from 85 | |

482. | Eleven family: Subtract 1, 11 & 31 from 77 | |

483. | Eleven family: Subtract 1, 11 & 21 from 68 | |

484. | Eleven family: Subtract 1, 11 & 71 from 96 | |

485. | Subtract 2, 12 from 100 | |

486. | Subtract 3, 13 from 100 | |

487. | Subtract 5, 15 from 100 | |

488. | Subtract 7, 17 from 100 | |

489. | Subtract 8, 18 from 100 | |

490. | Subtract 4, 14 from 100 | |

491. | Subtraction chains 80-6-5-3, 70-4-2-5 | |

492. | Subtraction chains 30-9-2-5, 60-5-4-3 | |

493. | Subtraction chains 40-5-6-3, 50-9-2-8 | |

494. | Subtraction chains 90-3-5-3, 40-2-8-5 | |

495. | Subtraction chains 60-9-2-3, 50-3-6-10 | |

496. | Changing Numbers 84 to 63 | |

497. | Changing Numbers 100 to 44 | |

498. | Changing Numbers 40 to 24 | |

499. | Changing Numbers 124 to 98 | |

500. | Write the missing number: 25 + 3 + ? = 35 | |

501. | Write the missing number: 25 + 4 + ? = 35 | |

502. | Write the missing number: 25 + 2 + ? = 35 | |

503. | Write the missing number: 25 + 5 + ? = 35 | |

504. | Write the missing number: 25 + 1 + ? = 35 | |

505. | Write the missing number: 35 + 5 + ? = 50 | |

506. | Write the missing number: 35 + 7 + ? = 50 | |

507. | Write the missing number: 35 + 9 + ? = 50 | |

508. | Write the missing number: 35 + 13 + ? = 50 | |

509. | Write the missing number: 35 + 11 + ? = 50 | |

510. | Subtracting tens: 88 - ? = 48 | |

511. | Subtracting tens: 57 - ? = 27 | |

512. | Subtracting tens: 44 - ? = 24 | |

513. | Subtracting tens: 86 - ? = 56 | |

514. | Subtracting tens: 94 - ? = 24 | |

515. | Subtracting tens 55 - 20 = ? | |

516. | Subtracting tens 48 - 20 = ? | |

517. | Subtracting tens 72 - 30 = ? | |

518. | Subtracting tens 87 - 60 = ? | |

519. | Subtracting tens 91 - 60 = ? | |

520. | The Mysteries of 40!: 40-?=31, 40-?=33, 40-?=30 | |

521. | The Mysteries of 40!: 40-?=51, 40-?=38, 40-?=32 | |

522. | The Mysteries of 40!: 40-?=32, 40-?=29, 40-?=37 | |

523. | The Mysteries of 40!: 40-?=29, 40-?=38, 40-?=39 | |

524. | The Mysteries of 40!: 40-?=30, 40-?=33, 40-?=36 | |

525. | The Mysteries of 40!: 40-?=29, 40-?=31, 40-?=33 | |

526. | The Mysteries of 40!: 40-?=28, 40-?=32, 40-?=18 | |

527. | The Mysteries of 30!: 30-?=26, 30-?=23, 30-?=27 | |

528. | The Mysteries of 30!: 30-?=23, 30-?=13, 30-?=3 | |

529. | The Mysteries of 30!: 30-?=18, 30-?=15, 30-?=12 | |

530. | The Mysteries of 30!: 30-?=14, 30-?=19, 30-?=9 | |

531. | Subtraction chains: 30-4-10-8, 30-5-10-7 | |

532. | Subtraction chains: 30-4-16-8, 30-5-3-11 | |

533. | Subtraction chains: 30-8-6-12, 30-6-3-5 | |

534. | Subtraction chains: 30-3-4-13, 30-6-5-7 | |

535. | Subtraction chains: 30-10-9-4, 30-5-9-7 | |

536. | Changeover: 7 less than 301 | |

537. | Changeover: 6 less than 904 | |

538. | Changeover: 6 less than 503 | |

539. | Changeover: 7 less than 204 | |

540. | Changeover: 8 less than 305 | |

541. | Tropical fruit feast: 4 x $5 | |

542. | Times change: Click all statements correctly describing the array | |

543. | Times change: Click all statements correctly describing the array | |

544. | Times change: Click all statements correctly describing the array | |

545. | Times change: Click all statements correctly describing the array | |

546. | Times change: Click all statements correctly describing the array | |

547. | Dollar Shares: Half of $6 | |

548. | Bozo and the cupcakes: Half of 10 is ? | |

549. | Bozo and the cupcakes: 10 is half of ? | |

550. | Half of 46 buses | |

551. | Bozo and the cupcakes: Half of 8 is ? | |

552. | Bozo and the cupcakes: 8 is half of ? | |

553. | Kind Aunties: Share $20 among 4 | |

554. | Dividing the cake | |

555. | Dividing the cake | |

556. | Dino Dinner Divide - working backwards | |

557. | Cake Work - working backwards | |

558. | Build a Total - number sequence, 15 | |

559. | Piecing the Petals: Select correct half to complete picture | |

560. | Tower In Two: Select correct half to complete picture | |

561. | Half A Crown - select correct half to complete picture | |

562. | Half Lighting - select correct half to complete picture | |

563. | Torn In Two - select correct half to complete picture | |

564. | Fragment of a Flag - select correct half to complete picture | |

565. | Tiger in Two - select correct half to complete picture | |

566. | Half A Butterfly - select correct half to complete picture | |

567. | Half A Stool - select correct half to complete picture | |

568. | The Shirt Off My Back - select correct half to complete picture | |

569. | Half A Hat - select correct half to complete picture | |

570. | The Chicken Story: forty + thirty | |

571. | 16 go to WaterWorld: 5+4+3+? | |

572. | 17 go to Waterworld: 6+5+2+? | |

573. | 14 go to Waterworld: 6+3+2+? | |

574. | 18 go to WaterWorld: 3+3+2+? | |

575. | 15 go to WaterWorld: 5+3+2+? | |

576. | 16 go to Waterworld? 2+3+3+? | |

577. | Chicken multiplication: 3 + 3 + 3 = ? | |

578. | Dollar Shares: Half of $10 | |

579. | Dollar Shares: Half of $8 | |

580. | Bessie Finds Half: 6 geese a-laying | |

581. | Bessie Finds Half: 8 maids a-milking | |

582. | Bessie Finds Half: 12 proud pink flamingos | |

583. | The Chicken Story: sixty + thirty | |

584. | The Chicken Story: fifty + twenty | |

585. | 19 go to Waterworld: 5+4+3+? | |

586. | Make 50: 32+8+? = 50 | |

587. | Tropical Fruit Feast: $10 = 5 x ? | |

588. | Tropical Fruit Feast: $8 = 4 x ? | |

589. | Tropical fruit feast: 2 x $4 | |

590. | Tropical fruit feast: 2 x $2 | |

591. | Movie money: $18 / 3 | |

592. | Bessie Finds Half: 12 chocolates | |

593. | Halving Lambs: A group of 18 lambs | |

594. | Finding Half: 6 basketballs | |

595. | Give Gary Half: 6 choc bars | |

596. | Half the Party: 8 kookaburras up a gum tree | |

597. | Freezing Fractions - 12 Antarctic penguins | |

598. | Huge Grinley's: 1 quarter of 4 cars | |

599. | Quartered for Serving: 8 apricot marshmallows | |

600. | Quartered Crop- 16 fresh green crisp juicy apples | |

601. | Sharing Quarters - 12 bright red toy steam engines | |

602. | Saving Half: $20 / 2 | |

603. | Fractions with Fauna: 60 cents halved | |

604. | Fledgling Fractions: 60 cents / 2 | |

605. | Cash Halves - Half of: $18 | |

606. | Share Bears: A group of 16 fluffy teddies to be halved | |

607. | Find Half: A batch of 14 steak 'n' bacon pies | |

608. | Half of 10 fierce pirates | |

609. | 20 swimming swans: Put half on each pond | |

610. | Find Half: 6 Flamingoes Balancing | |

611. | Find Half: 8 monsters mixing | |

612. | Half and half: 8 pieces | |

613. | Half the herd. 12 bulls | |

614. | 10 butterflies fluttering: Halve them! | |

615. | Four moist mangos_shared | |

616. | Make 1 whole butterfly | |

617. | Make 1 whole crown | |

618. | Make 1 whole flower | |

619. | Make 1 whole tophat | |

620. | Make 1 whole building | |

621. | Six Bright Berries | |

622. | David Determines Quarters: 12 supersonic jets | |

623. | David Determines Quarters: 8 scrumptious sponges | |

624. | Faye Feeds in Quarters: 16 pigeons | |

625. | David and Fran Take Fractions: Half of 8 | |

626. | David at the airport: Half of 6 | |

627. | David at the hospital: One quarter of 4 | |

628. | Build A Total - number sequence, 40 | |

629. | Build A Total - number sequence, 50 | |

630. | Build A Total - number sequence, 55 | |

631. | One Juicy Apple | |

632. | Gavin at the shop: 60c + 10c | |

633. | Damien at the shop: 10c + 5c | |

634. | Jenny at the shop: 60c + 30c | |

635. | Sarah at the shop: 50c + 40c | |

636. | Emma at the shop: 2 x 5c | |

637. | Samuel at the shop: 3 x 10c | |

638. | Zachary at the shop: 3 x 5c | |

639. | Emma at the shop: 25c + 15c | |

640. | Charlotte at the shop: 60c + 25c | |

641. | Marjorie at the shop: 70c + 15c | |

642. | Felicity at the shop: 50c + 45c | |

643. | Amy at the shop: 50c + 10c | |

644. | David at the shop: 45c + 30c | |

645. | Alisa at the shop: 40c + 25c | |

646. | Ayesha at the shop: 25c + 10c | |

647. | Sherwyn at the shop: 50c + 30c | |

648. | Fizah at the shop: 25c + 30c | |

649. | Shyla at the shop: 25c + 70c |