1. Australian Curriculum
  2. Mathematics
  3. Year 5
  4. Number and Algebra
  5. Number and place value

ACMNA099

Use estimation and rounding to check the reasonableness of answers to calculations

1. About Half: 615 89 58 915
2. About Half: 780 390 96 1080
3. About Half: 63 585 789 6232
4. About Half: 62 585 4112 38 120 6258
5. About Half: 89 590 926 17 680 1834
6. About Half: 67 899 77 020 7020 8199
7. About Half: 59 730 53 030 5020 5902
8. About Half: 42 289 48 928 409 4120
9. About Half: 34 008 21 119 1987 3369
10. Round to the nearest 1000: 2689 1500 6999
11. Round to the nearest 1000: 1001 1999 4050
12. Round to the nearest 1000: 4698 6010 4449
13. Round to the nearest 1000: 1501 1499 1999
14. Round to the nearest 1000: 8750 2496 5671
15. Rounding to nearest 100: 258 840 686
16. Rounding to nearest 100: 251 949 670
17. Rounding to nearest 100: 43 450 699
18. Rounding to nearest 100: 899 159 378
19. Rounding to nearest 100: 60 116 161
20. Round to the nearest 100: 287, 957, 793
21. Round to the nearest 100: 951, 450, 1698
22. Round to the nearest 100: 1598, 1450, 1499
23. Round to the nearest 100: 18 420, 69 510, 77 352
24. Round to the nearest 100: 105 248, 398 429, 367 950
25. Round to the nearest 1000: 125 369, 425 877, 786 357
26. Round to the nearest 1000: 598 635, 459 352, 987 201
27. Round to the nearest 1000: 598 258, 952 698, 169 999
28. Round to the nearest 1000: 369 247, 987 365, 654 589
29. Round to the nearest 1000: 654 741, 321 123, 696 969
30. Round to the nearest 1000: 987 523, 659 137, 498 951
31. Round to nearest 10 000: 12 589 35 698 45 100
32. Round to nearest 10 000: 16 258 11 100 65 196
33. Round to nearest 10 000: 15 369 85 587 78 444
34. Round to nearest 100 000: 102 258 698 012 258 369
35. Round to nearest 10 000: 654 321 128 259 439 636
36. Round to nearest 1000: 12 211 36 950 104 401
37. Round to nearest 1000: 28 650 10 070 19 01
38. Round to nearest 1000: 4450 4550 9500
39. Round to the nearest 10 000: 14 602 32 987 57 704
40. Round to the nearest 10 000: 11 450 19 101 56 852
41. Round to nearest 10 000: 112 369 419 837 665 789
42. Round to nearest 10 000: 232 697 148 693 945 500
43. Round to nearest 100 000: 1 159 362 4 379 258 8 402 928
44. Round to nearest 100 000: 4 787 255 1 659 345 5 426 899
45. Round to nearest 100 000: 8 789 025 2 458 023 1 367 528
46. Round to nearest 10 000: 24 589 325 002 164 997
47. Round to nearest 100 000: 2 050 006 3 545 683 4 009 045
48. Round to nearest 10 000: 4 542 125 5 552 369 7 769 582
49. Round to nearest 10 000: 6 564 287 2 319 279 477 021
50. Round to nearest 100 000: 3 469 125 7 782 425 2 372 158
51. An apple a day: 1000 / 160
52. On the Road: 95 x 4
53. Christmas Greetings: How many 45c stamps from $1
54. Up or Down: How many whole groups of 10 in 24?
55. Up or down: How many 2m streamers from 9m of ribbon
56. Up or down: 11 kg / 3kg
57. Up or down: 10 cups / 4 cups
58. Up or down: 40 / 15
59. Up or down: 7kg / 5kg
60. Up or Down - 555/55
61. Up or Down
62. Up or Down - 8
63. Up or Down - 9
64. Up or Down:
65. Up or down 56/10
66. Up or down 290/60
67. Up or down 500/60
68. Up or down 430/50
69. Up or down 27/5
70. Up or down: 100 / 40
71. Up or down: 1600 / 250
72. Up or down: 42/5
73. Up or Down: 44/8
74. Up or Down: 23/6
75. Up or Down: 83/9
76. Up or down 39/15
77. Up or down: Decide whether to round up or down after division
78. Up or down: Decide whether to round up or down after division
79. About to divide: Click the best estimate of the answer
80. Up or down: Decide whether it is sensible to round up or down after division
81. Up or down: Decide whether it is sensible to round up or down after division
82. Bill's Buckets - match appropriate bucket size to required volume
83. Bill's Buckets - rounding up to nearest litre
84. Bill's Buckets - rounding up to nearest litre
85. Round About 1 - rounding to nearest 10cm
86. Size It Up 6 - select best estimate for height of a giraffe
87. The Great Measurement Round-Up 3 - round m to nearest km
88. The Great Measurement Round-Up 2 - round cm to nearest m
89. The Great Measurement Round-Up 1 - round mm to nearest cm
90. Around About... - rounding g to the nearest kg
91. Around About... - rounding to the nearest kg
92. Around About... - rounding g to the nearest kg
93. Up or Down: 36 people at 15 per turn
94. Up or Down: 5 meringues x 5 egg whites = How many dozen eggs?
95. Up or Down: How many whole 30cm lengths in 1m?
96. Up or Down: (170 + 10) / 50
97. Up or Down: $75 / 20
98. Up or Down - 3 (1)
99. Rounding - Round to 10: 268
100. Rounding - Round to 100: 62
101. Rounding - Round to 100: 350
102. Rounding - Round to 10: 902
103. Rounding - Round to 10: 99
104. Rounding - Round to 10: 705
105. Round and round we go: Round 2dp to a whole number
106. Rounding - Round to 100: 68
107. Rounding - Round to 100: 911
108. Rounding - Round to 100: 345
109. Rounding - Round to 100: 438
110. Rounding - Round to 100: 691
111. Rounding - Round to 100: 224
112. Rounding - Round to 100: 749
113. Rounding - Round to 100: 198
114. Rounding - Round to 100: 850
115. Rounding - Round to the nearest whole number: 288.8
116. Rounding - Round to 100: 572
117. Rounding - Round to the nearest whole number: 100.4
118. Rounding - Round to the nearest whole number: 165.1
119. Rounding - Round to the nearest whole number: 59.5
120. Rounding - Round to the nearest whole number: 24.9
121. See You Round: Round to the nearest thousand: 1945
122. See You Round: Round to the nearest thousand: 57501
123. See You Round: Round to the nearest thousand: 18011
124. See You Round: Round to the nearest thousand: 6399
125. See You Round: Round to the nearest thousand: 3721
126. See You Round: Round to the nearest thousand: 31948
127. See You Round: Round to the nearest thousand: 22586
128. See You Round: Round to the nearest thousand: 9387
129. See You Round: Round to the nearest thousand: 7319
130. See You Round: Round to the nearest thousand: 4747
131. See You Round: Round to the nearest ten thousand: 25627
132. See You Round: Round to the nearest ten thousand: 573882
133. See You Round: Round to the nearest ten thousand: 1789 790
134. See You Round: Round to the nearest thousand: 43 209
135. See You Round: Round to the nearest hundred thousand: 1824781
136. See You Round: Round to the nearest ten thousand: 5 293 174
137. See You Round: Round to the nearest hundred thousand: 722156
138. See You Round: Round to the nearest hundred thousand: 250 987
139. About Half: 902 394
140. About Half: 303 406
141. About Half: 797 196
142. About Half: 501 297
143. About Half: 97 607
144. About Half: 2009 6992
145. About Half: 6978 4012
146. About Half: 8019 998
147. About Half: 4975 3006
148. About Half: 1997 6011
149. About Half: 7007.9 2986.2
150. About Half: 7991.6 5015.8
151. About Half: 2010.7 8979.5
152. About Half: 3999.1 9027.4
153. About Half: 1003.3 5985.7
154. About Half: 1979.6 6005.1
155. About Half: 4015.9 1998.1
156. About Half: 3002.5 8978.5
157. About Half: 19 837.91, 70 011.09
158. About Half: 30 198.11, 89 997.23
159. About Half: 59 763.25, 40 289.37
160. See You Round: Round to the nearest thousand: 602
161. See You Round: Round to the nearest ten: 4018
162. See You Round: Round to the nearest hundred: 5747
163. See You Round: Round to the nearest thousand: 4503
164. Round and round we go: Round 2dp to a whole number
165. Round and round we go: Round 2dp to a whole number
166. Round and round we go: Round 2dp to a whole number
167. Round and round we go: Round 2dp to a whole number
168. Round to the nearest 100: 453 665, 399 655, 290 099
169. Round to the nearest 1000: 870 560, 499 975, 533 245
170. Round to the nearest 100: 234 567, 123 456, 345 678
171. Round to the nearest 10 000: 113 455, 384 990, 438 003
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