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