ACMNA128
Add and subtract decimals, with and without digital technologies, and use estimation and rounding to check the reasonableness of answers
| 1. | 0.1 less, 0.1 more than 42.6 | |
| 2. | 0.1 less, 0.1 more than 98.1 | |
| 3. | 0.1 less, 0.1 more than 71.9 | |
| 4. | 0.1 less, 0.1 more than 85.3 | |
| 5. | 0.1 less, 0.1 more than 19.9 | |
| 6. | 0.1 less, 0.1 more than 40 | |
| 7. | 0.1 less, 0.1 more than 22 | |
| 8. | 0.1 less, 0.1 more than 25.5 | |
| 9. | 0.1 less, 0.1 more than 33.8 | |
| 10. | 10 less, 0.1 more than 80.1 | |
| 11. | 0.1 less, 0.1 more than 50.1 | |
| 12. | 0.1 less, 0.1 more than 42.9 | |
| 13. | 0.1 less, 0.1 more than 28.5 | |
| 14. | 0.1 less, 0.1 more than 82 | |
| 15. | 0.1 less, 0.1 more than 99 | |
| 16. | 0.1 less, 0.1 more than 99.9 | |
| 17. | Round to the nearest whole number: 25.61 39.42 96.91 | |
| 18. | Round to the nearest whole number: 95.11 42.34 64.24 | |
| 19. | Round to the nearest whole number: 65.95 45.76 63.77 | |
| 20. | Juggling Hundredths: One hundredth less than 100 | |
| 21. | Juggling Hundredths: one hundredth less than 1000 | |
| 22. | Juggling Hundredths: eight hundredths less than 100 | |
| 23. | Juggling Hundredths: seven hundredths less than 78 | |
| 24. | Juggling Hundredths: 23 - 0.15 | |
| 25. | Juggling Hundredths: 13 + 0.96 | |
| 26. | Juggling Hundredths: 26 + 100 hundredths | |
| 27. | Juggling Hundredths: 54 hundredths more than 45 | |
| 28. | Changing Numbers: 8.1 +1.1, +11.1, x 0.1, x10 | |
| 29. | Changing Numbers: 9.2 + 0.1, +101, x 0.1, x10 | |
| 30. | Changing Numbers: 6.2 +1, +10, x 0.1, X100 | |
| 31. | Changing Numbers: 5.5 x 1, x 10, x 10, x 100 | |
| 32. | Changing Numbers: 4.3 +10, - 0.1, x 10, x 100 | |
| 33. | Changing Numbers: 16.4 +1, +10.1, x 0.1, x10 | |
| 34. | Changing Numbers: 85.3 + 0.1, +1, x 0.1, x100 | |
| 35. | Changing Numbers: 25.46 x10, x.01, +1010, ÷0.1 | |
| 36. | Changing Numbers: 12.64 x10, x0.1, +100.1, +11.1 | |
| 37. | Changing Numbers: 110.53 x 0.01,+11.1, +1.1, ÷ 0.1 | |
| 38. | Changing Numbers: 27.43 +11.1, +1.01, x10, x0.1 | |
| 39. | Changing Numbers: 33.25 x10, +11.1, +1.1, ÷0.1 | |
| 40. | Changing Numbers: 61.36 x10, x 0.1, +10.01, ÷0.01 | |
| 41. | Changing Numbers: 79.81 x 0.1, x100, +101, +0.1 | |
| 42. | Changing Numbers: 58.32 x 100, + 10.1, - 0.01, ÷10 | |
| 43. | Changing Numbers: 83.56 x10, +11, +1.1, ÷ 10 | |
| 44. | Movin' One Up! 0.7+?=1 | |
| 45. | Scoring decimal points: 19.3+2.3=*1.* | |
| 46. | Scoring decimal points: *3.6+*.2=25.* | |
| 47. | Scoring decimal points: 1*.2+2.7=*9.* | |
| 48. | Scoring decimal points: 1*.*+2.5=*0.8 | |
| 49. | Scoring decimal points: 2*.2+1.5=*7.* | |
| 50. | Use The pattern 1.4+1.5, 10.4+10.5, 104+105 | |
| 51. | Use The pattern 1.2+1.7, 10.2+10.7, 102 107 | |
| 52. | Use The pattern 1.4+1.4, 10.4+10.4, 104+104 | |
| 53. | Use The pattern 1.2+1.3, 10.2+10.3, 102+103 | |
| 54. | Use The pattern 1.2+1.4, 10.2+10.4, 102+104 | |
| 55. | Fiona's day out | |
| 56. | Scoring Decimal Points: Complete vertical algorithm | |
| 57. | Scoring Decimal Points: Complete vertical algorithm | |
| 58. | Scoring Decimal Points: Complete vertical algorithm | |
| 59. | Scoring Decimal Points: Complete vertical algorithm | |
| 60. | Scoring Decimal Points: Complete vertical algorithm | |
| 61. | Decimals get together: 6.7+?=10 | |
| 62. | Decimals get together: 5.8+4.2=? | |
| 63. | Decimals get together: ?+3.7=10 | |
| 64. | Add it up decimals: 26.7+5.4 | |
| 65. | Add it up decimals: 56.7+7.6 | |
| 66. | Add it up decimals:64.6+8.9=73.5 | |
| 67. | Add it up decimals: 36.5+7.9 | |
| 68. | Add it up decimals: 69.4+7.7 | |
| 69. | Ten up: What must be added to 62.3 to make 70? | |
| 70. | Adding decimals: Write missing numbers in vertical addition of 2-digit numbers with 1 dp | |
| 71. | Adding decimals: Write missing numbers in vertical addition of 2-digit numbers with 1 dp | |
| 72. | Adding decimals: Write missing numbers in vertical addition of 2-digit numbers with 1 dp | |
| 73. | Adding decimals: Write missing numbers in vertical addition of 2-digit numbers with 1 dp | |
| 74. | Adding decimals: Write missing numbers in vertical addition of 2-digit numbers with 1 dp | |
| 75. | Add it up: Addition of decimal numbers with regrouping | |
| 76. | Add it up: Addition of decimal numbers with regrouping | |
| 77. | Add it up: Addition of decimal numbers with regrouping | |
| 78. | Add it up: Addition of decimal numbers with regrouping | |
| 79. | Add it up: Addition of decimal numbers with regrouping | |
| 80. | Number detectives mystery decimals: 0.02+?, 0.26+?, 0.44+?=1 | |
| 81. | Number detectives mystery decimals: 0.33+?, 0.62+?, 0.84+?=1 | |
| 82. | Number detectives mystery decimals: 0.08+?, 0.15+?, 0.73+?=1 | |
| 83. | Number detectives mystery decimals: 0.29+?, 0.82+?, 0.06+?=1 | |
| 84. | Number detectives mystery decimals: 0.45+?, 0.01+?, 0.22+?=1 | |
| 85. | Ten Up 57.81 to 60 | |
| 86. | Ten Up 63.72 to 70 | |
| 87. | Ten Up 46.98 to 50 | |
| 88. | Ten Up 22.56 to 30 | |
| 89. | Ten Up 15.32 to 20 | |
| 90. | Ten Up 133.36 to 140 | |
| 91. | Ten Up 165.83 to 170 | |
| 92. | Ten Up 132.64 to 140 | |
| 93. | Ten Up 113.95 to 120 | |
| 94. | Ten Up 188.66 to 190 | |
| 95. | Scoring Decimal Points: 2*.*+14.9 = *8.5 | |
| 96. | Decimal Dropouts : Decimal hundredths totalling 1 | |
| 97. | Decimal Dropouts : Decimal hundredths totalling 1 | |
| 98. | Decimal Dropouts : Decimal hundredths totalling 1 | |
| 99. | Decimal Dropouts : Decimal hundredths totalling 1 | |
| 100. | Decimal Dropouts : Decimal hundredths totalling 1 | |
| 101. | Scoring Decimal Points: *2.4* + 9.*0 = 4*.09 | |
| 102. | Scoring Decimal Points: *4.34 + 7*.0* = 93.*1 | |
| 103. | Scoring Decimal Points: 7.5* + *.*0 = *2.46 | |
| 104. | Scoring Decimal Points: 4.*6 + 3.1* = *.08 | |
| 105. | Scoring Decimal Points: 8.6* + *.91 = 11.*3 | |
| 106. | Scoring Decimal Points: 7.4* + *.68 = 11.*1 | |
| 107. | Scoring Decimal Points: *.16 + 7.9* = 10.*1 | |
| 108. | Scoring Decimal Points: 4.61 + 6.*3 = **.4* | |
| 109. | Add it up 148.82+76.59 | |
| 110. | Add it up 137.87+28.95 | |
| 111. | Add it up 146.29+11.72 | |
| 112. | Add it up 237.27+23.91 | |
| 113. | Add it up 348.26+56.32 | |
| 114. | Changing numbers 2.351 add 0.3, 0.003, 0.03 | |
| 115. | Changing numbers 5.391 add 4, 0.004, 0.4 | |
| 116. | Changing numbers 4.345 add 0.004, 40, 0.04 | |
| 117. | Changing numbers 1.221 Add 0.7, 0.07, 7.007 | |
| 118. | Changing numbers 3.539 add 0.001, 1.1, 1.01 | |
| 119. | Add these three numbers 6.2+1.6+7.2 | |
| 120. | Add these three numbers 4.8+5.2+8.7 | |
| 121. | Add these three numbers 2.5+9.5+2.7 | |
| 122. | Add these three numbers 7.3+1.7+8.1 | |
| 123. | Add these three numbers 3.3+2.5+2.7 | |
| 124. | Scoring decimal points: Write the missing numbers in vertical decimal addition | |
| 125. | Scoring decimal points: Write the missing numbers in vertical decimal addition | |
| 126. | Scoring decimal points: Write the missing numbers in vertical decimal addition | |
| 127. | Scoring decimal points: Write the missing numbers in vertical decimal addition | |
| 128. | Scoring decimal points: Write the missing numbers in vertical decimal addition | |
| 129. | Hundredths crossing: Add/subtract crossing a tenths/whole number bound | |
| 130. | Hundredths crossing: Add/subtract crossing a tenths/whole number bound | |
| 131. | Hundredths crossing: Add/subtract crossing a tenths/whole number bound | |
| 132. | Hundredths crossing: Add/subtract crossing a tenths/whole number bound | |
| 133. | Hundredths crossing: Add/subtract crossing a tenths/whole number bound | |
| 134. | Hundredths crossing 69.39+6.38 | |
| 135. | Hundredths crossing 79.33+5.99 | |
| 136. | Hundredths crossing 37.22+6.37 | |
| 137. | Hundredths crossing 156.54+6.77 | |
| 138. | Hundredths crossing 49.22+0.87 | |
| 139. | Decimal Drops: 27.* - 15.3 = 1*.3 | |
| 140. | Decimal Drops: 63.* - 4*.6 = *2.2 | |
| 141. | Decimal Drops: 54.* - 37.7 = *7.1 | |
| 142. | Decimal Drops: 48.8 - 2*.* = *9.5 | |
| 143. | Decimal Drops: 81.4 - 22.* = *9.2 | |
| 144. | Spot the Difference: Write the difference between 3 number pairs | |
| 145. | Spot the Difference: Write the difference between 3 number pairs | |
| 146. | Spot the Difference: Write the difference between 3 number pairs | |
| 147. | Spot the Difference: Write the difference between 3 number pairs | |
| 148. | Spot the Difference: Write the difference between 3 number pairs | |
| 149. | Tenths Crossing: 40.4-0.5, 63.5-0.6, 30.6-0.7 | |
| 150. | Tenths Crossing: 20.2-0.4, 37.7-0.9, 17.5-0.9 | |
| 151. | Tenths Crossing: 26.5-0.8, 55.5-0.9, 74.3-0.7 | |
| 152. | Tenths Crossing: 44.4-0.8, 38.6-0.7, 23.2-0.5 | |
| 153. | Tenths Crossing: 88.5-0.8, 65.3-0.5, 43.6-0.9 | |
| 154. | Scoring Decimal Points: Complete vertical algorithm | |
| 155. | Scoring Decimal Points: Complete vertical algorithm | |
| 156. | Scoring Decimal Points: Complete vertical algorithm | |
| 157. | Scoring Decimal Points: Complete vertical algorithm | |
| 158. | Scoring Decimal Points: Complete vertical algorithm | |
| 159. | Mysteries of 20: Decimals | |
| 160. | Mysteries of 20: Decimals | |
| 161. | Mysteries of 20: Decimals | |
| 162. | Mysteries of 20: Decimals | |
| 163. | Mysteries of 20: Decimals | |
| 164. | Use the Pattern: Subtract (16-.3)(160-3)(1600-30) | |
| 165. | Use the Pattern: Subtract (15-0.1)(150-1)(1500-10) | |
| 166. | Use the Pattern: Subtract (20-0.4)(200-4)(2000-40) | |
| 167. | Use the Pattern: Subtract (13-.7)(113-7)(1300-70) | |
| 168. | Use the Pattern: Subtract (17-.5)(170-5)(1700-50) | |
| 169. | Use the Pattern: Subtract (11-0.6)(110-6)(1100-60) | |
| 170. | Subtraction Chains: 14.8 -2-0.6-0.1, ?-5=20.4,-0.2-5 | |
| 171. | Subtraction Chains: ?-3=15.4, -0.1-8, ?-4-0.5-0.2=9.2 | |
| 172. | Subtraction Chains: ?-4=12.6,-0.5-2, ?-5=15.5,-3-0.2 | |
| 173. | Subtraction Chains: ?-4=14.7,-0.3-4.4, ?-5=11.9,-0.1-0.7 | |
| 174. | Subtraction Chains: ?-4.2=11.5,-1.1-3.3, ?-15.5-3-6.5=6 | |
| 175. | Running the race: Addition and subtraction of distances | |
| 176. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 177. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 178. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 179. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 180. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 181. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 182. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 183. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 184. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 185. | Scoring Decimal Points: Write missing numbers in vertical addition of decimal numbers | |
| 186. | Number Detectives: Subtracting decimals | |
| 187. | Number Detectives: Subtracting decimals | |
| 188. | Number Detectives: Subtracting decimals | |
| 189. | Number Detectives: Subtracting decimals | |
| 190. | Number Detectives: Subtracting decimals | |
| 191. | Number Detectives: Subtracting decimals | |
| 192. | Number Detectives: Subtracting decimals | |
| 193. | Number Detectives: Subtracting decimals | |
| 194. | Number Detectives: Subtracting decimals | |
| 195. | Number Detectives: Subtracting decimals | |
| 196. | Cheetin' Horses: Comparison of speeds in km/hr | |
| 197. | Thirsty work: Comparison of volumes | |
| 198. | Crossing the line: Subtracting distances | |
| 199. | Decimal mysteries 50 -*=11.08,-*=36.15,-*=16.46 | |
| 200. | Decimal mysteries 50 -*=26.33,-*=37.85,-*=1.07 | |
| 201. | Decimal mysteries 50 -*=8.28,-*=22.16,-*=32.77 | |
| 202. | Decimal mysteries 50 -*=21.44,-*=30.53,-*=13.19 | |
| 203. | Decimal mysteries 50 -*=32.65,-*=13.21,-*=24.17 | |
| 204. | Spot the difference 493.8&412.6 | |
| 205. | Spot the difference 248.7&218.3 | |
| 206. | Spot the difference 759.5&734.1 | |
| 207. | Spot the difference 695.6&623.2 | |
| 208. | Spot the difference 176.9&141.5 | |
| 209. | Decimal Drops: Write the missing numbers in vertical decimal subtractions | |
| 210. | Decimal Drops: Write the missing numbers in vertical decimal subtractions | |
| 211. | Decimal Drops: Write the missing numbers in vertical decimal subtractions | |
| 212. | Decimal Drops: Write the missing numbers in vertical decimal subtractions | |
| 213. | Decimal Drops: Write the missing numbers in vertical decimal subtractions | |
| 214. | Scoring decimal points: Write missing numbers in vertical decimal subtractions | |
| 215. | Scoring decimal points: Write missing numbers in vertical decimal subtractions | |
| 216. | Scoring decimal points: Write missing numbers in vertical decimal subtractions | |
| 217. | Scoring decimal points: Write missing numbers in vertical decimal subtractions | |
| 218. | Scoring decimal points: Write missing numbers in vertical decimal subtractions | |
| 219. | True/false: Decimal subtraction 2 dp | |
| 220. | True/false: Decimal subtraction 2 dp | |
| 221. | True/false: Decimal subtraction 2 dp | |
| 222. | Scoring decimal points: Write missing numbers in vertical subtractions | |
| 223. | Scoring decimal points: Write missing numbers in vertical subtractions | |
| 224. | Spot the Difference: Decimal subtraction calculation 2dp | |
| 225. | Spot the Difference: Decimal subtraction calculation 2dp | |
| 226. | It's a long way to the concert: Money addition and multiplication | |
| 227. | Liquid Maths - half a L jugs to fill 5.5L bucket | |
| 228. | Sugar High? - adding g to kg, 2 decimal places | |
| 229. | Up And Up: 1.6+0.7 | |
| 230. | Up And Up: 1.7+1.1 | |
| 231. | Up And Up: 1.9+0.3 | |
| 232. | Up And Up: 1.5+0.4 | |
| 233. | Up And Up: 1.7+0.4 | |
| 234. | Up And Up: 11.2+4.5 | |
| 235. | Up and Up: 13.4+6.3 | |
| 236. | Movin' One Up! 0.1+?=1 | |
| 237. | Movin' One Up! 0.5+?=1 | |
| 238. | Movin' One Up! 0.2+?=1 | |
| 239. | Movin' One Up! 0.4+?=1 | |
| 240. | How Much Less? 1.2<2, 15.5<16, 3.8,4? | |
| 241. | How Much Less? 11.6<12, 13.7<14, 7.5<10? | |
| 242. | How Much More? 7>6.5, 1>0.2, 10>4.8 | |
| 243. | How Much More? 20>19.4, 12>11.8, 10>6.5? | |
| 244. | Up and Up: 74.9+22.6 | |
| 245. | Up and Up: 52.4+14.8 | |
| 246. | Up and Up: 33.6+45.5 | |
| 247. | Up and Up: 64.7+13.5 | |
| 248. | Movin' On Up! 13.7+?=16 | |
| 249. | Decimal Descent: 72.6-31.3 | |
| 250. | Decimal Descent: 46.7-11.3 | |
| 251. | Decimal Descent: 54.3-22.1 | |
| 252. | Up and Up: 15.2+3.9 | |
| 253. | Up and Up: 11.8+6.5 | |
| 254. | Up and Up: 13.6+4.7 | |
| 255. | Up and Up: 14.4+2.8 | |
| 256. | Up and Up: 10.9+5.3 | |
| 257. | Decimal Descent: 21.7-6.8 | |
| 258. | Decimal Descent: 34.2-6.5 | |
| 259. | Decimal Descent: 11.3-8.7 | |
| 260. | Decimal Descent: 40.6-8.7 | |
| 261. | Decimal Descent: 64.5-5.8 | |
| 262. | Up and Up: 76.04+9.09 | |
| 263. | Up and Up: 24.92+3.26 | |
| 264. | Up and Up: 65.39+6.21 | |
| 265. | Up and Up: 28.21+0.81 | |
| 266. | Up and Up: 13.45+7.05 | |
| 267. | Decimal Descent: 45.99-1.71 | |
| 268. | Decimal Descent: Difference between 2 decimal numbers (same no.dec. plces) | |
| 269. | Decimal Descent: 7.63-1.51 | |
| 270. | Decimal Descent: 25.54-5.1 | |
| 271. | Decimal Descent: 63.83-3.93 | |
| 272. | Decimal Descent: 17.62-16.51 | |
| 273. | Decimal Descent: 37.97-2.97 | |
| 274. | Decimal Descent: Difference between 2 decimal numbers (same no.dec. plces) | |
| 275. | Decimal Descent: 25.73-2.8 | |
| 276. | Decimal Descent: Difference between 2 decimal numbers (same no.dec. plces) | |
| 277. | Decimal Descent: Difference between 2 decimal numbers (same no.dec. plces) | |
| 278. | Decimal Descent: 153-151.5 | |
| 279. | Decimal Descent: Difference between 2 decimal numbers (same no.dec. plces) | |
| 280. | Decimal Descent: Difference between 2 decimal numbers (same no.dec. plces) | |
| 281. | Movin' On Up! 13.9+?=16 | |
| 282. | Movin' On Up! 12.5+?=15 | |
| 283. | Movin' On Up! 11.2+?=14 | |
| 284. | Movin' On Up! 15.8+?=18 | |
| 285. | Up and Up: 11.8+1.9 | |
| 286. | Up and Up: 13.2+2.9 | |
| 287. | Up and Up: 10.8+6.8 | |
| 288. | Up and Up: 12.7+4.4 | |
| 289. | Up and Up: 13.3+5.8 | |
| 290. | Decimals get together: 7.6+?=10 | |
| 291. | Decimals get together: 2.7+7.3=? | |
| 292. | Decimals get together: ?+1.1=10 | |
| 293. | Decimals get together: 5.4+?=10 | |
| 294. | Decimals get together: 4.7+5.3=? | |
| 295. | Decimals get together: ?+5.7=10 | |
| 296. | Decimals get together: 3.8+?=10 | |
| 297. | Decimals get together: 3.4+6.6=? | |
| 298. | Decimals get together: ?+7.1=10 | |
| 299. | Decimals get together: 5.9+?=10 | |
| 300. | Decimals get together: 3.7+6.3=? | |
| 301. | Decimals get together: ?+6.7=10 | |
| 302. | Up and Up: 130.45+60.56 | |
| 303. | Up and Up: 3.8+2.6=? | |
| 304. | Up and Up: 21.4+4.5=? | |
| 305. | Up and Up: 13.4+6.3=? | |
| 306. | Up and Up: 14.4+7.3=? | |
| 307. | Up and Up: 17.4+6.2=? | |
| 308. | Up and Up: 16.3+7.5=? | |
| 309. | Up and Up: 13.4+5.4=? | |
| 310. | Ten up: What must be added to 34.4 to make 40? | |
| 311. | Ten up: What must be added to 18.3 to make 20? | |
| 312. | Ten up: What must be added to 46.5 to make 50? | |
| 313. | Ten up: What must be added to 26.8 to make 30? | |
| 314. | Tenths Tournament: 0.5 less than 7.5 | |
| 315. | Tenths Tournament: 1- 0.6 | |
| 316. | Tenths Tournament: Take 0.5 from 0.9 | |
| 317. | Tenths Tournament: 6.9 minus 0.4 | |
| 318. | Tenths Tournament: 1- 0.5 | |
| 319. | Tenths Tournament: 8.3 plus 0.2 | |
| 320. | Tenths Tournament: 1- 0.1 | |
| 321. | Tenths Tournament: 0.6 more than 5.3 | |
| 322. | Tenths Tournament: Add 0.4 to 4.3 | |
| 323. | Tenths Tournament: 1- 0.7 | |
| 324. | Tenths Tournament: 6.1 + 0.8 | |
| 325. | Tenths Tournament: 0.1 less than 9.4 | |
| 326. | Tenths Tournament: Take 0.4 from 1.8 | |
| 327. | Tenths Tournament: 1- 0.8 | |
| 328. | Tenths Tournament: 1- 0.2 | |
| 329. | Crossing the line: Subtracting distances |