Use and record a range of mental strategies to solve addition and subtraction problems involving one- and two-digit numbers, including:counting on from the larger number to find the total of two numbers, counting back from a number to find the number rema
| 1. | 2 less, 2 more than 4 | |
| 2. | 2 less, 2 more than 12 | |
| 3. | 2 less, 2 more than 16 | |
| 4. | 2 less, 2 more than 9 | |
| 5. | 2 less, 2 more than 11 | |
| 6. | Which number is 10 more than 14? | |
| 7. | 2 less, 2 more than 28 | |
| 8. | 2 less, 2 more than 15 | |
| 9. | 2 less, 2 more than 23 | |
| 10. | 2 less, 2 more than 13 | |
| 11. | Changing numbers: 36 to 39 | |
| 12. | Changing Numbers: 24 to 21 | |
| 13. | Changing Numbers: 66 to 76 | |
| 14. | Changing Numbers: 80 to 78 | |
| 15. | Changing Numbers: 50 to 45 | |
| 16. | Changing Numbers: 35 to 40 | |
| 17. | Changing Numbers: 10 to 15 | |
| 18. | Changing Numbers: 20 to 30 | |
| 19. | Changing Numbers: 45 to 35 | |
| 20. | Changing Numbers: 90 to 100 | |
| 21. | Changing Numbers: 85 to 80 | |
| 22. | Changing Numbers: 45 to 50 | |
| 23. | Changing Numbers: 99 to 100 | |
| 24. | Changing Numbers: 24 to 14 | |
| 25. | Changing Numbers: 85 to 80 | |
| 26. | Changing Numbers: 48 to 50 | |
| 27. | Up We Go - Start at 3. Add 4 more. | |
| 28. | Up We Go - Start at 2. Add 4 more. | |
| 29. | Up We Go - Start at 6. Add 2 more. | |
| 30. | Up We Go - Start at 5. Add 2 more. | |
| 31. | Up we go - What is 5 plus 3? | |
| 32. | Up we go - What is 3 + 2? | |
| 33. | Up we go - 4 add 2 | |
| 34. | 20s Zone - 4 more than 22 | |
| 35. | 20s Zone - 4 more than 21 | |
| 36. | 20s Zone - 3 more than 24 | |
| 37. | Addition chain: 4 + 1 = 5, 5 + 2 = ? | |
| 38. | Addition chain: 2 + 2 = 4, 4 + 1 = ? | |
| 39. | Addition chain: 3 + 2 = 5, 5 + 1 = ? | |
| 40. | Teens zone: 7 more than 8 | |
| 41. | Teens zone: 2 more than 9 | |
| 42. | Word Wise: The sum of 10 and 4 | |
| 43. | Word Wise: Add 1 and 12 | |
| 44. | Word Wise: Add 5 to 7 | |
| 45. | Word Wise: 7 plus 6 | |
| 46. | Word Wise: 8 plus 3 | |
| 47. | Word Wise: 7 plus 4 | |
| 48. | Use the Pattern: 4+3, +4, +5 | |
| 49. | 20s Zone: 16 + 4 = ?, 16 + 6 = ? | |
| 50. | 20s Zone: 18 + 2 = ?, 18 + 5 = ? | |
| 51. | Addition Chain: 5 + 3 = ? + 3 = ? | |
| 52. | Addition Chain: 6 + 4 = ? + 5 = ? | |
| 53. | Addition Chain: 2 + 4 = ? + 5 = ? | |
| 54. | Addition Chain: 3 + 9 = ? + 1 = ? | |
| 55. | Addition Chain: 4 + 3 = ? + 5 = ? | |
| 56. | Use the Pattern: 4+0, +10, +20 | |
| 57. | Use the Pattern: 5+0, +10, +20 | |
| 58. | Use the Pattern: 7+0, +10, +20 | |
| 59. | Use the Pattern: 6+0, +10, +20 | |
| 60. | Use the Pattern: 3+0, +10, +20 | |
| 61. | Use the Pattern: 9+0, +10, +20 | |
| 62. | Is the answer...?: Click all boxes with answer 8. | |
| 63. | Is the answer...?: Click all boxes with answer 12 | |
| 64. | Is the answer...?: Click all boxes with answer 14 | |
| 65. | Is the answer...?: Click all boxes with answer 11 | |
| 66. | Is the answer...?: Click all boxes with answer 15 | |
| 67. | Is the answer...?: Click all boxes with answer 13 | |
| 68. | Changing Numbers: 24 to 34 | |
| 69. | Changing Numbers: 25 to 26 | |
| 70. | Changing Numbers: 17 to 21 | |
| 71. | Changing Numbers: 10 to 21 | |
| 72. | Changing Numbers: 7 to 11 | |
| 73. | Changing Numbers: 8 to 13 | |
| 74. | Changing Numbers: 9 to 12 | |
| 75. | Changing Numbers: 17 to 21 | |
| 76. | Changing Numbers: 18 to 21 | |
| 77. | Changing Numbers: 27 to 31 | |
| 78. | Changing Numbers: 24 to 28 | |
| 79. | Changing Numbers: 29 to 39 | |
| 80. | Changing Numbers: 30 to 50 | |
| 81. | Changing Numbers: 48 to 50 | |
| 82. | 30s Zone: 4 more than 28 | |
| 83. | 30s Zone: 7 more than 25 | |
| 84. | 30s Zone: 5 more than 29 | |
| 85. | 30s Zone: 9 more than 29 | |
| 86. | Use the Pattern: 5+4,15+4,25+4 | |
| 87. | Use the Pattern: 6+4,16+4,26+4 | |
| 88. | Use the Pattern: 10+2,20+2,30+2 | |
| 89. | Thrilling Thirties: 3 more than 29 | |
| 90. | Thrilling Thirties: Five more than twenty-seven | |
| 91. | Thrilling Thirties: 4 more than 28 | |
| 92. | Thrilling Thirties: 5 more than 26 | |
| 93. | Thrilling Thirties: 4 plus 29 | |
| 94. | Fabulous Forties: 4 more than 38 | |
| 95. | Fabulous Forties: 6 plus 37 | |
| 96. | Fabulous Forties: 5 more than 39 | |
| 97. | Fabulous Forties: 6 plus 36 = ? | |
| 98. | Fabulous Forties: 4 more than 37 = ? | |
| 99. | Word Wise: 15 added to 6 | |
| 100. | Beyond 30 - 4 more than 38 | |
| 101. | Double Up and Add: Double 6 plus 4 | |
| 102. | Double Up and Add: Double 10 plus 7 | |
| 103. | Double Up and Add: Double 9 plus 2 | |
| 104. | Same or Different: Click all the boxes with the answer 28. | |
| 105. | Three Up!: Add 3 to 60, 20, 50 | |
| 106. | Two Up!!: Add 2 to 23, 15, 37 | |
| 107. | Two Up!!: Add 2 to 29, 80, 12 | |
| 108. | Two Up!!: Add 2 to 14, 24, 44 | |
| 109. | One Up!: Add 1 to 65, 19, 42 | |
| 110. | Changing numbers: 24 changes to 33 | |
| 111. | Changing numbers: 19 changes to 28 | |
| 112. | Changing numbers: 13 changes to 21 | |
| 113. | Changing numbers: 9 changes to 17 | |
| 114. | Changing numbers: 8 changes to 17 | |
| 115. | Happy Landings 6 - 3 | |
| 116. | Happy Landings 5 minus 3 | |
| 117. | Happy Landings 4 - 3 | |
| 118. | Happy landings 9 take away 3 | |
| 119. | Happy Landings 9 minus 6 | |
| 120. | Happy landings 10 take away 2 | |
| 121. | Subtraction chain 8 - 4 = 4, 4 - 2 = ? | |
| 122. | Subtraction chain 7 - 2 = 5, 5 - 2 = ? | |
| 123. | Subtraction chain 9 - 3 = 6, 6 - 2 = ? | |
| 124. | Subtraction chain 6 - 3 = 3, 3 - 1 = ? | |
| 125. | Subtraction chain 8 - 2 = 6, 6 - 1 = ? | |
| 126. | Happy Landings 8 minus 5 | |
| 127. | Happy Landings Take 4 from 9 | |
| 128. | Happy Landings 8 Take away 4 | |
| 129. | Subtraction chain 9 - 1 = 8, 8 - 2 = ? | |
| 130. | Subtraction chain 8 - 3 = 5, 5 - 2 = ? | |
| 131. | Subtraction chain 6 - 2 = 4, 4 - 2 = ? | |
| 132. | Subtraction chain 7 - 3 = 4, 4 - 1 = ? | |
| 133. | Subtraction chain 9 - 2 = 7, 7 - 3 = ? | |
| 134. | Crossing 10: Add 7 to 8 | |
| 135. | Crossing 10: 14-4; 14-7=? | |
| 136. | Crossing 10: Add 5 to 8 | |
| 137. | Crossing 10: Add 5 to 9 | |
| 138. | Crossing 10: Add 9 to 6 | |
| 139. | Crossing 10: 14-4; 10-7=? | |
| 140. | Crossing 10: 13-3; 10-9=? | |
| 141. | Crossing 10: 17-7; 17-9=? | |
| 142. | Crossing 10: Add 8 to 5 | |
| 143. | Crossing 10: Add 9 to 9. | |
| 144. | Hide and Seek: 7 trolls - 5 | |
| 145. | Hide and Seek: 7 trolls - 4 | |
| 146. | Hide and Seek: 6 trolls - 4 | |
| 147. | Hide and Seek: 8 trolls - 4 | |
| 148. | 7 Clocks: How many more to make 15? | |
| 149. | 9 Cars: How many more to make 16? | |
| 150. | Number detectives: 14 - 6 = ? | |
| 151. | Number detectives: 15 - 9 = ? | |
| 152. | Number detectives: 11 - 8 = ? | |
| 153. | Number detectives: 13 - 5 = ? | |
| 154. | Number detectives: 15 - 13 = ? | |
| 155. | Party time: 17 - 9 | |
| 156. | Party time: 16 - 9 | |
| 157. | Party time: 19 - 9 | |
| 158. | Party time: 18 - 9 | |
| 159. | Party time: 12 - 9 | |
| 160. | Party time: 11 - 9 | |
| 161. | Party time: 10 - 9 | |
| 162. | Party time: 9 - 9 | |
| 163. | Party time: 15 - 9 | |
| 164. | Find the first number: ? count on 5 = 8 | |
| 165. | Find the first number: ? count on 1 = 8 | |
| 166. | Find the first number: ? count on 2 = 8 | |
| 167. | Find the first number: ? count back 1 = 8 | |
| 168. | Find the first number: ? count back 2 = 8 | |
| 169. | Find the first number: ? count back 3 = 8 | |
| 170. | Find the first number: ? count back 4 = 8 | |
| 171. | Find the first number: ? count on 3 = 8 | |
| 172. | Find the first number: ? count on 4 = 8 | |
| 173. | Card games: Which is lower, 4 + 2 or 6 + 1? | |
| 174. | Card games: Which is lower, 7 + 3 or 5 + 4? | |
| 175. | Card games: Which is lower, 6 + 4 or 2 + 3? | |
| 176. | Card games: Which is lower, 4 + 3 or 1 + 9? | |
| 177. | Card games: Which is higher, 4 + 5 or 5 + 1? | |
| 178. | Which number is 10 less than 20? | |
| 179. | Which number is 10 less than 50? | |
| 180. | Number detectives 18 -10 = ? | |
| 181. | Word Wise: Subtract 14 from 20 | |
| 182. | Word Wise: Subtract 5 from 19 | |
| 183. | Word Wise: Subtract 4 from 17 | |
| 184. | Word Wise: Subtract 9 from 20 | |
| 185. | Word Wise: 17 take away 6 | |
| 186. | Word Wise: 19 take away 9 | |
| 187. | Word Wise: 20 take away 11 | |
| 188. | Word Wise: 14 take away 6 | |
| 189. | Word Wise: 11 less than 19 | |
| 190. | Word Wise: 13 less than 20 | |
| 191. | Word Wise: 6 less than 12 | |
| 192. | Word Wise: 11 less than 16 | |
| 193. | Use the pattern: 8 - 4, - 3, - 2 | |
| 194. | Use the pattern: 6 - 6, - 5, - 4 | |
| 195. | Slippery fish 9 - 9 = ? | |
| 196. | Slippery fish 14 - 8 = ? | |
| 197. | Slippery fish 18 - 12 = ? | |
| 198. | Slippery fish 12 - 3 = ? | |
| 199. | Slippery fish 15 - 10 = ? | |
| 200. | Slippery fish 10 - 9 = ? | |
| 201. | Slippery fish 11 - 7 = ? | |
| 202. | Changing numbers: 18 to 9 | |
| 203. | Changing numbers: 16 to 12 | |
| 204. | Changing numbers: 12 to 7 | |
| 205. | Changing numbers: 20 to 9 | |
| 206. | Changing numbers: 14 to 9 | |
| 207. | The 20s zone: 24 - 4 = ?, 24 - 7 = ? | |
| 208. | Take 10: 40 - 10 = ? | |
| 209. | Subtraction chain 20 - 3 = 17, 17 - 3 = ? | |
| 210. | Subtraction chain 20 - 6 = 14, 14 - 5 = ? | |
| 211. | Subtraction chain 20 - 5 = 15, 15 - 2 = ? | |
| 212. | Subtraction chain 20 - 9 = 11, 11 - 3 = ? | |
| 213. | Word Wise!: Subtract 13 from 20 | |
| 214. | Word Wise!: Subtract 15 from 20 | |
| 215. | Word Wise!: Subtract 8 from 20 | |
| 216. | Word Wise!: Subtract 11 from 20 | |
| 217. | Word Wise!: Subtract 17 from 20 | |
| 218. | Word Wise!: Subtract 5 from 20 | |
| 219. | Word Wise!: 12 minus 7 | |
| 220. | Word Wise!: 20 take away 4 | |
| 221. | Word Wise!: 20 take away 7 | |
| 222. | Word Wise!: 19 less than 19 | |
| 223. | Word Wise!: 3 less than 20 | |
| 224. | Word Wise!: 10 less than 20 | |
| 225. | Hide and seek: 10 trolls - 5 | |
| 226. | Hide and seek: 14 trolls - 5 | |
| 227. | Hide and seek: 11 trolls - 5 | |
| 228. | Slippery fish 16 - 7 | |
| 229. | Subtraction Chain - 27-20-13 | |
| 230. | Subtraction Chain - 28-7=21-5=? | |
| 231. | Subtract 8 (from 16, 15, 12) | |
| 232. | Subtract 6 (from 12, 11, 13) | |
| 233. | Subtract 5 (from 14, 11, 8) | |
| 234. | Subtract 7 (from 14, 16, 11) | |
| 235. | Subtract 4 (from 10, 12, 8) | |
| 236. | Use the pattern 16-4=? 26-3=?, 36-4=? | |
| 237. | Use the pattern 14-3=? 24-3=?, 34-3=? | |
| 238. | Use the pattern 15-3=? 25-3=?, 35-3=? | |
| 239. | Use the pattern 18-5=? 28-5=?, 38-5=? | |
| 240. | Subtract 8 from 17, 13 & 11 | |
| 241. | Subtract 6 from 13, 15 & 11 | |
| 242. | Subtract 7 from 24, 22 & 25 | |
| 243. | Subtract 5 from 21, 20 & 24 | |
| 244. | Subtract 9 from 12, 15 & 17 | |
| 245. | 8 Spaces to Park: 4 cars. How many more cars can fit? | |
| 246. | 8 spaces to park: 8 - 4 | |
| 247. | 8 spaces to park: 8 - 6 | |
| 248. | 8 spaces to park: 8 - 7 | |
| 249. | 8 spaces to park: 8 - 5 | |
| 250. | 8 Spaces to Park: 5 cars. How many more cars can fit? | |
| 251. | 8 Spaces to Park: 6 cars. How many more cars can fit? | |
| 252. | 8 Spaces to Park: 7 cars. How many more cars can fit? | |
| 253. | Birds flock together 3 + 2 = ? | |
| 254. | Birds flock together 6 + 2 = ? | |
| 255. | Birds flock together 1 + 7 = ? | |
| 256. | Birds flock together 4 + 4 = ? | |
| 257. | Birds flock together 5 + 3 = ? | |
| 258. | Card games: 6 + 4 = ?, 2 + 3 = ? | |
| 259. | Card games: 7 + 4 = ?, 9 + 8 = ? | |
| 260. | Card games: 7 + 9 = ?, 8 + 3 = ? | |
| 261. | Card games: 5 + 8 = ?, 7 + 9 = ? | |
| 262. | Card games: 9 + 9 = ?, 8 + 6 = ? | |
| 263. | The 20s zone: 28 - 8 = ?, 28 - 9 = ? | |
| 264. | The 20s zone: 23 - 3 = ?, 23 - 4 = ? | |
| 265. | The 20s zone: 26 - 6 = ?, 26 - 8 = ? | |
| 266. | Card games: Which is higher, 5 + 4 or 3 + 7? | |
| 267. | Card games: Which is higher, 3 + 5 or 4 + 8? | |
| 268. | Card games: Which is higher, 5 + 9 or 6 + 4? | |
| 269. | Card games: Which is higher, 4 + 6 or 9 + 3? | |
| 270. | Card games: Which is lower, 9 + 3 or 6 + 7? | |
| 271. | Card games: Which is lower, 2 + 6 or 4 + 2? | |
| 272. | The 20s Zone: Add 6 to 18 | |
| 273. | The 20s Zone: Add 5 to 16 | |
| 274. | The 20s Zone: Add 7 to 15 | |
| 275. | Teen Zone: Add 9 to 7 | |
| 276. | Teen Zone: Take 8 from 15 | |
| 277. | Teen Zone: Take 7 from 16 | |
| 278. | Teen Zone: Take 5 from 13 | |
| 279. | Teen Zone: Take 7 from 14 | |
| 280. | Teen Zone: Take 9 from 17 | |
| 281. | Teen Zone: Take 7 from 12 | |
| 282. | Teen Zone: Take 8 from 15 | |
| 283. | Teen Zone: Take 8 from 15 | |
| 284. | Teen Zone: Add 5 to 7 | |
| 285. | The 20s Zone: Add 7 to 17 | |
| 286. | Teen Zone: Take 7 from 15 | |
| 287. | Teen Zone: Take 9 from 16 | |
| 288. | Teen Zone: Take 9 from 18 | |
| 289. | Teen Zone: Take 11 from 17 | |
| 290. | Teen Zone: Take 9 from 14 | |
| 291. | Teen Zone: Add 6 to 6 | |
| 292. | The 20s Zone: Add 6 to 17 | |
| 293. | The 20s Zone: Add 6 to 15 | |
| 294. | The 20s Zone: Add 6 to 19 | |
| 295. | Teen Zone: Add 8 to 7 | |
| 296. | Crossing 10: Take 8 from 17 | |
| 297. | Crossing 10: Take 9 from 17 | |
| 298. | Crossing 10: Take 9 from 13 | |
| 299. | Crossing 10: Take 9 from 15 | |
| 300. | Crossing 10: Take 9 from 14 | |
| 301. | Crossing 10: Take 8 from 13 | |
| 302. | Crossing 10: Take 7 from 14 | |
| 303. | The 20s Zone: Take 6 from 24 | |
| 304. | The 20s Zone: Take 8 from 24 | |
| 305. | The 20s Zone: Take 6 from 25 | |
| 306. | The 20s Zone: Take 4 from 21 | |
| 307. | The 20s Zone: Take 8 from 25 | |
| 308. | The 20s Zone: Take 9 from 23 | |
| 309. | The 20s Zone: Take 7 from 23 | |
| 310. | The 20s Zone: Take 8 from 26 | |
| 311. | The 20s Zone: Take 7 from 22 | |
| 312. | The 20s Zone: Take 8 from 27 | |
| 313. | Count back: Start at 16. Count back 5 | |
| 314. | 9 Clocks: How many more to make 15? | |
| 315. | 5 Clocks: How many more to make 15? | |
| 316. | 7 Cars: How many more to make 16? | |
| 317. | Card Tricks: Red 3 + Black 7 |