Solve problems, including missing number problems, using number facts, place value, and more complex addition and subtraction
| 1. | Changing Numbers: 324 to 314 | |
| 2. | Changing Numbers: 562 to 662 | |
| 3. | Changing Numbers: 500 to 510 | |
| 4. | Changing Numbers: 444 to 445 | |
| 5. | Changing Numbers: 100 to 200 | |
| 6. | Changing Numbers: 265 to 255 | |
| 7. | Changing Numbers: 550 to 650 | |
| 8. | Changing Numbers: 300 to 299 | |
| 9. | Changing Numbers: 888 to 898 | |
| 10. | Changing Numbers: 428 to 438 | |
| 11. | Changing Numbers: 204 to 194 | |
| 12. | Changing Numbers: 402 to 412 | |
| 13. | Changing Numbers: 399 to 499 | |
| 14. | Changing Numbers - 45 to 145 | |
| 15. | Changing Numbers - 235 to 225 | |
| 16. | Changing Numbers - 990 to 890 | |
| 17. | Changing Numbers - 576 to 577 | |
| 18. | Changing Numbers - 36 to 136 | |
| 19. | Changing Numbers - 455 to 555 | |
| 20. | Changing Numbers - 4323 to 4423 | |
| 21. | Make 20: 7+4+? | |
| 22. | Make 20: 11+5+? | |
| 23. | Make 20: 8+9+? | |
| 24. | Add these 3 numbers: 9+10+4 | |
| 25. | Who's going to Waterworld? 5+4+3+2 | |
| 26. | Add Board: *0 + 20 = 100 | |
| 27. | Make 50: 20+10+? | |
| 28. | Make 50: 20+10+? | |
| 29. | Make 50: 20+10+? | |
| 30. | Make 50: 20+10+? | |
| 31. | Make 50: 20+10+? | |
| 32. | Adding tens: 26 + ? = 36 | |
| 33. | Adding tens: 46 + ? = 56 | |
| 34. | Adding tens: 64 + ? = 94 | |
| 35. | Adding tens: ?+ 36 = 66 | |
| 36. | Adding tens: ?+ 73 = 83 | |
| 37. | Adding tens: ?+ 46 = 86 | |
| 38. | Changing numbers 136 to 140 | |
| 39. | Changing numbers 122 to 130 | |
| 40. | Changing numbers 154 to 160 | |
| 41. | Changing numbers 188 to 190 | |
| 42. | Changing numbers 177 to 180 | |
| 43. | Add three numbers: 13 + 9 + 7 | |
| 44. | Make 30: 10 + 11 + ? = 30 | |
| 45. | Make 50: 20+10+? | |
| 46. | Make 30: 19 + 2 + ? = 30 | |
| 47. | Make 30: 20 + 10 + ? = 30 | |
| 48. | Make 30: 16 + 4 + ? = 30 | |
| 49. | Make 30: 18 + 3 + ? = 30 | |
| 50. | Adding tens: 24 + ? = 64, 24 + 50 = ? | |
| 51. | Adding tens: 57 + ? = 97, 57 + 20 = ? | |
| 52. | Make 50: 40 + 4 + ? | |
| 53. | Make 34: 10 + 22 + ? | |
| 54. | Number detectives: 30+?, 50+?, 60+? =100 | |
| 55. | Number detectives: 25+?, 35+?, 55+? =100 | |
| 56. | Number detectives: 5+?, 45+?, 15+?=100 | |
| 57. | Number detectives: ? + 9 = 49 | |
| 58. | Number detectives: ? + 11 = 53 | |
| 59. | Make 50: 39+7+? = 50 | |
| 60. | Make 50: 39+5+? = 50 | |
| 61. | Make 50: 35+5+? = 50 | |
| 62. | Make 50: 38+10+? = 50 | |
| 63. | Make 50: 42+6+? = 50 | |
| 64. | 100 Zone: 70 + 40 = ? 90 + ? = 110, ? + 80 = 110 | |
| 65. | 100 Zone: 60 + 80 = ? 90 + ? = 140, ? + 100 = 140 | |
| 66. | 100 Zone: 70 + 80 = ? 100 + ? = 150, ? + 70 = 150 | |
| 67. | 100 Zone: 90 + 70 = ? 80 + ? = 160, ? + 60 = 160 | |
| 68. | Changing Numbers 29 to 34 | |
| 69. | Changing Numbers 67 to 78 | |
| 70. | Changing Numbers 98 to 101 | |
| 71. | Changing Numbers 87 to 92 | |
| 72. | Changing Numbers 59 to 63 | |
| 73. | Changing Numbers 96 to 101 | |
| 74. | Changing Numbers 98 to 105 | |
| 75. | Changing Numbers 97 to 103 | |
| 76. | Changing Numbers 97 to 102 | |
| 77. | Changing Numbers 99 to 103 | |
| 78. | Changing Numbers 42 to 62 | |
| 79. | Changing Numbers 63 to 93 | |
| 80. | Changing Numbers 137 to 157 | |
| 81. | Number detectives 45+*=100 | |
| 82. | Number detectives 75+*=100 | |
| 83. | Number detectives 85+*=100 | |
| 84. | Number detectives 35+*=100 | |
| 85. | Number detectives 5+*=100 | |
| 86. | Number detectives *+109 = 113 | |
| 87. | Number detectives *+4 = 103 | |
| 88. | Number detectives *+5 = 103 | |
| 89. | Number detectives 98+7=* | |
| 90. | Number detectives 485+*= 493 | |
| 91. | Number detectives 515+*= 523 | |
| 92. | Number detectives 95+*=101 | |
| 93. | Number detectives 97+*=103 | |
| 94. | Make 200: 130+50+* | |
| 95. | Make 200: 70+100+* | |
| 96. | Make 200: 60+40+* | |
| 97. | Make 200: 90+30+* | |
| 98. | Make 200: 150+40+* | |
| 99. | Addition Chains 21 + 3 + 6 + 5, 60 + 4 + 3 + 2 | |
| 100. | Addition Chains 33 + 4 + 10 + 5, 28 + 3 + 9 + 8 | |
| 101. | Addition Chains 23 + 5 + 4 + 9, 60 + 8 + 3 + 10 | |
| 102. | Addition Chains 95 + 4 + 2 + 12, 94 + 3 + 3 + 7 | |
| 103. | Changing numbers: 12 + 10, +11, +111 | |
| 104. | Changing numbers: 28 + 10, +11, +111 | |
| 105. | Changing numbers: 49 + 10, +11, +111 | |
| 106. | Changing numbers: 88 + 10, +11, +111 | |
| 107. | Changing numbers: 29 + 10, +11, +111 | |
| 108. | Number Detectives: 100 Pairs ? + 79 = 100 | |
| 109. | Number Detectives: 100 Pairs ? + 51 = 100 | |
| 110. | Number Detectives: 100 Pairs 63 + 37 = ? | |
| 111. | Number Detectives: 100 Pairs 88 + ? = 100 | |
| 112. | On the Board 45 + 3* = *7 | |
| 113. | On the Board 3* + *5 = 98 | |
| 114. | On the Board 4* + 42 = *9 | |
| 115. | On the Board 3* + 62 = *6 | |
| 116. | On the Board 8* + *6 = 98 | |
| 117. | On the Board 33 + *5 = 7* | |
| 118. | On the Board *8 + 51 = 7* | |
| 119. | Number Detectives: 100 Pairs 85 + ?, 75 + ?, 45 +?= 100 | |
| 120. | Use the pattern: 5+2,50+20, 500+200=? | |
| 121. | Use the pattern: 2+3,20+30, 200+300=? | |
| 122. | Same or different:44-8,14+23,22+18,19+17,54-18 | |
| 123. | Same or different:43-7,21+17,13+22,18+16,53-17 | |
| 124. | On the Board: *24 + 92= 6** | |
| 125. | On the Board: **1 + 38= 30* | |
| 126. | On the Board: *8*+91=*78 | |
| 127. | On the Board: *46+*2=43* | |
| 128. | On the Board: 53*+*2=*29 | |
| 129. | On the Board: *6*+73=5*6 | |
| 130. | Make 100: 50, 20 & ? | |
| 131. | Make 100: 60, 20 & ? | |
| 132. | Make 100: 10, 40 & ? | |
| 133. | Make 100: 10, 30 & ? | |
| 134. | Make 100: 60, 40 & ? | |
| 135. | On the Board: *4+7*=100 | |
| 136. | On the Board: *4+3*=100 | |
| 137. | Mysteries of 30!: 20+?, 15+?, 5+? | |
| 138. | Mysteries of 30!: 19+?, 10+?, 16+? | |
| 139. | Mysteries of 30!: 12+?, 13+?, 14+? | |
| 140. | Mysteries of 30!: 9+?, 5+?, 7+? | |
| 141. | Mysteries of 30!: 26+?, 28+?, 22+? | |
| 142. | Complem. add/subtract: 136+419=555 | |
| 143. | Hundreds and hundreds: 42?+3?8=79? | |
| 144. | Hundreds and hundreds: ?64+5?9=90? | |
| 145. | Hundreds and hundreds: 17?+?23=2?7 | |
| 146. | Hundreds and hundreds: 364+235=? | |
| 147. | Make 1000: 500+300+? | |
| 148. | Make 1000: 600+300+? | |
| 149. | Make 1000: 400+100+? | |
| 150. | Make 1000: 400+200+? | |
| 151. | Make 1000: 200+100+? | |
| 152. | Number detectives: 60+?, 50+?, 75+?=100 | |
| 153. | Addition chains 10 multiples | |
| 154. | 100 zone: 295+8=?, 798+?=804, ?+9=405 | |
| 155. | 100 zone: 294+8=?, 396+?=401, ?+4=705 | |
| 156. | 100 zone: 295+9=?, 596+?=602, ?+8=201 | |
| 157. | 100 zone: 399+5=?, 895+7=902, ?+6=503 | |
| 158. | 100 zone: 698+6=704, 292+?=301, ?+8=503 | |
| 159. | Comp. pairs add/subtract: 678+156=834 | |
| 160. | Write the missing number: 11 + ? + 2 = 20 | |
| 161. | Write the missing number: 6 + 9 + ? = 20 | |
| 162. | Taking Tens: 90 - ? = 70 | |
| 163. | Put in the missing number: 5 + 4 + ? = 16 | |
| 164. | Put in the missing number: 11 + ? + 6 = 25 | |
| 165. | Write in the missing number: ? + 13 + 5 = 21 | |
| 166. | Use the pattern: 10, 20 & 80 - 5 = ? | |
| 167. | Use the pattern: 10, 20 & 40 - 3 = ? | |
| 168. | Write the missing number: 20 + 3 + ? = 30 | |
| 169. | Write the missing number: 12 + ? + 10 = 30 | |
| 170. | Write the missing number: 15 + ? + 5 = 30 | |
| 171. | Write the missing number: 9 + ? + 12 = 30 | |
| 172. | Write the missing number: ? + 5 + 4 = 30 | |
| 173. | Write the missing number: 15 + ? + 6 = 30 | |
| 174. | Write the missing number: 18 + ? + 2 = 30 | |
| 175. | Write the missing number: 20 + 3 + ? = 30 | |
| 176. | Write the missing number: ? + 13 + 5 = 30 | |
| 177. | Write the missing number: 14 + 7 + ? = 30 | |
| 178. | Takeaway board: 3? - 14 = 23 | |
| 179. | Takeaway board: 2? - 13 = 13 | |
| 180. | Takeaway board: 4? - 22 = 27 | |
| 181. | Takeaway board: 6? - 12 = 55 | |
| 182. | Takeaway board: 5? - 26 = 32 | |
| 183. | Subtract.chains 32 - 4 - 7 - 4, 45 - 2 - 10 - 5 | |
| 184. | Spot the difference: 102 & 97, 27 & 19, 100 & 60 | |
| 185. | Changing Numbers 55-37=? | |
| 186. | Changing Numbers 65-54=? | |
| 187. | Changing Numbers 48-22=? | |
| 188. | Changing Numbers 36-16=? | |
| 189. | Changing Numbers 51-28=? | |
| 190. | Changing Numbers 42-32=? | |
| 191. | Write the missing number: 7 + ? + 14 = 30 | |
| 192. | Write the missing number: 15 + 4 + ? = 30 | |
| 193. | Write the missing number: 12 + 10 + ? = 30 | |
| 194. | Write the missing number: 15 + 5 + ? = 30 | |
| 195. | Write the missing number: 18 + 8 + ? = 30 | |
| 196. | Write the missing number: 5 + 5 + ? = 30 | |
| 197. | Number Detectives: ? - 15 = 10 | |
| 198. | Number Detectives: ? - 9 = 21 | |
| 199. | Number Detectives: 30 - 17 = ? | |
| 200. | Number Detectives: 30 - 14 = ? | |
| 201. | Number Detectives: 30 - ? = 12 | |
| 202. | Number Detectives: 40 - ? = 29 | |
| 203. | Takeaway board 152-? = 144 | |
| 204. | Takeaway board 547-? = 538 | |
| 205. | Takeaway board 553-? = 546 | |
| 206. | Takeaway board 291-? 285 | |
| 207. | Takeaway board 742-? = 737 | |
| 208. | Takeaway Board ?9-18 = 71 | |
| 209. | Takeaway Board 67-1?=53 | |
| 210. | Takeaway Board 79-?8=61 | |
| 211. | Takeaway Board ?7-17=50 | |
| 212. | Takeaway Board ?3-21=72 | |
| 213. | Subtract 2, 12 from 100 | |
| 214. | Subtract 3, 13 from 100 | |
| 215. | Subtract 5, 15 from 100 | |
| 216. | Subtract 7, 17 from 100 | |
| 217. | Subtract 8, 18 from 100 | |
| 218. | Subtract 4, 14 from 100 | |
| 219. | Find first number: After I count back 5, the new number is 299. Where did I start? | |
| 220. | Find first number: After I count back 4, the new number is 197. Where did I start? | |
| 221. | Find first number: After I count back 6, the new number is 395. Where did I start? | |
| 222. | Find first number: After I count back 7, the new number is 596. Where did I start? | |
| 223. | Find first number: After I count back 8, the new number is 95. Where did I start? | |
| 224. | Changing Numbers 84 to 63 | |
| 225. | Changing Numbers 100 to 44 | |
| 226. | Changing Numbers 40 to 24 | |
| 227. | Changing Numbers 124 to 98 | |
| 228. | Write the missing number: 25 + 3 + ? = 35 | |
| 229. | Write the missing number: 25 + 4 + ? = 35 | |
| 230. | Write the missing number: 25 + 2 + ? = 35 | |
| 231. | Write the missing number: 25 + 5 + ? = 35 | |
| 232. | Write the missing number: 25 + 1 + ? = 35 | |
| 233. | Write the missing number: 35 + 5 + ? = 50 | |
| 234. | Write the missing number: 35 + 7 + ? = 50 | |
| 235. | Write the missing number: 35 + 9 + ? = 50 | |
| 236. | Write the missing number: 35 + 13 + ? = 50 | |
| 237. | Write the missing number: 35 + 11 + ? = 50 | |
| 238. | Hundreds takeaway 350-**=330 | |
| 239. | Hundreds takeaway 697-**=614 | |
| 240. | Hundreds takeaway 457-**=425 | |
| 241. | Hundreds takeaway 596-**=543 | |
| 242. | Hundreds takeaway 875-**=865 | |
| 243. | Hundreds takeaway 997-**=971 | |
| 244. | Subtracting tens: 88 - ? = 48 | |
| 245. | Subtracting tens: 57 - ? = 27 | |
| 246. | Subtracting tens: 86 - ? = 56 | |
| 247. | Subtracting tens: 94 - ? = 24 | |
| 248. | The Mysteries of 40!: 40-?=31, 40-?=33, 40-?=30 | |
| 249. | The Mysteries of 40!: 40-?=51, 40-?=38, 40-?=32 | |
| 250. | The Mysteries of 40!: 40-?=32, 40-?=29, 40-?=37 | |
| 251. | The Mysteries of 40!: 40-?=29, 40-?=38, 40-?=39 | |
| 252. | The Mysteries of 40!: 40-?=30, 40-?=33, 40-?=36 | |
| 253. | The Mysteries of 40!: 40-?=29, 40-?=31, 40-?=33 | |
| 254. | The Mysteries of 40!: 40-?=28, 40-?=32, 40-?=18 | |
| 255. | The Mysteries of 30!: 30-?=26, 30-?=23, 30-?=27 | |
| 256. | The Mysteries of 30!: 30-?=23, 30-?=13, 30-?=3 | |
| 257. | The Mysteries of 30!: 30-?=18, 30-?=15, 30-?=12 | |
| 258. | The Mysteries of 30!: 30-?=14, 30-?=19, 30-?=9 | |
| 259. | Subtraction chains: 30-4-10-8, 30-5-10-7 | |
| 260. | Subtraction chains: 30-4-16-8, 30-5-3-11 | |
| 261. | Subtraction chains: 30-8-6-12, 30-6-3-5 | |
| 262. | Subtraction chains: 30-3-4-13, 30-6-5-7 | |
| 263. | Subtraction chains: 30-10-9-4, 30-5-9-7 | |
| 264. | Spot the Difference: Between 169 and 176 | |
| 265. | Spot the Difference: Between 239 and 242 | |
| 266. | Spot the Difference: Between 465 and 472 | |
| 267. | Spot the Difference: Between 327 and 333 | |
| 268. | Spot the Difference: Between 689 and 694 | |
| 269. | Spot the difference: 160 and 174; 346 and 360; 190 and 204 | |
| 270. | Same or Different: Answer 43 | |
| 271. | Same or Different: Answer 77 | |
| 272. | Same or Different: Answer 69 | |
| 273. | Same or Different: Answer 56 | |
| 274. | Same or Different: Answer 38 | |
| 275. | Same or Different: Answer 24 | |
| 276. | The Mysteries of 40! 40-14,23,19 | |
| 277. | The Mysteries of 40! 40-8,12,25 | |
| 278. | The Mysteries of 40! 40-20,15,9 | |
| 279. | Take Tens: 73-?=53,630-90=? | |
| 280. | Take Tens: 98-?=18,920-60=? | |
| 281. | Complem. add/subtract: 492-116=376 | |
| 282. | Complem. add/subtract: 831-88=743 | |
| 283. | Complem. add/subtract: 634-97=537 | |
| 284. | Complem. add/subtract: 263-84=179 | |
| 285. | Complem. add/subtract: 751-47=704 | |
| 286. | Complem. add/subtract: 397-59=338 | |
| 287. | Hundreds Takeaway: 6*2-32* = *21 | |
| 288. | Hundreds Takeaway: **2-43*=362 | |
| 289. | Hundreds Takeaway: *1*-5*4=414 | |
| 290. | Subtraction chains: 94-20-14-11, 65-15-25-15 | |
| 291. | 100 zone: 600-3, 400-5, 200-7 | |
| 292. | 100 zone: 900-9, 700-7, 500-5 | |
| 293. | 100 zone: 700-2, 300-4, 100-6 | |
| 294. | 100 zone: 400-6, 300-4, 200-2 | |
| 295. | 100 zone: 800-8, 600-6, 400-4 | |
| 296. | Tens Takeaway: 400-20, 40 less than 480, ?-80=360 | |
| 297. | My Fair Sharer: write the correct setting on the fair sharer | |
| 298. | Make Five! - magic triangle puzzle, add to 5 | |
| 299. | All Things Equal - equivalent to 7 + 7 | |
| 300. | Sum In A Circle - numbers in each group total 15 | |
| 301. | Patterns - Which operation? 95*5=100 | |
| 302. | Dr Dan's Number Operations - "x - 6 = 7" | |
| 303. | The Busy Bus - students on and off bus | |
| 304. | Dr Dan's Number Operations - "x + 2 = 10" | |
| 305. | Number Quest - complete number sentence | |
| 306. | Number Quest - complete number sentence | |
| 307. | Build A Total - number sequence, 24 | |
| 308. | Tic Tac Two - use numbers 1, 2 and 3 to make all totals the same | |
| 309. | Make Five! - magic triangle puzzle, add to 5 | |
| 310. | Build A Total - number sequence, 30 | |
| 311. | Who's going to Waterworld? 4+4+2+5 | |
| 312. | Who's going to Waterworld? 2+3+3+10 | |
| 313. | Who's going to Waterworld? 7+3+2+3 | |
| 314. | Who's going to Waterworld? 5+4+5+3 | |
| 315. | The Chicken Story: seventy-seven + twelve | |
| 316. | Crossing 100: Add 70 to 60 | |
| 317. | Crossing 100: Add 60 to 80 | |
| 318. | Crossing 100: Add 90 to 40 | |
| 319. | Crossing 100: Add 50 to 90 | |
| 320. | Crossing 100: Add 50 to 70 | |
| 321. | Make 50: 32+8+? = 50 | |
| 322. | The Chicken Story: thirty-nine + twelve | |
| 323. | The Chicken Story: thirty-six + fourteen | |
| 324. | The Chicken Story: forty-one + seventeen | |
| 325. | The Chicken Story: thirteen + nineteen | |
| 326. | The Chicken Story: twenty-four + thirty-two | |
| 327. | Build A Total - number sequence, 55 | |
| 328. | Build A Total - number sequence, 44 | |
| 329. | Build A Total - number sequence, 36 | |
| 330. | Build A Total - number sequence, 28 |