Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 296 · 40 questions

How to do it in your head (Round up, add back): Round the number you take away up to the next ten or hundred: 297 → 300 (3 too many). Take away the round number. Add back the extra, because you took away too much.

1. 1.713 − 557 =
2. 2.968 − 687 =
3. 3.248 − 118 =
4. 4.824 − 207 =
5. 5.753 − 198 =
6. 6.962 − 339 =
7. 7.733 − 697 =
8. 8.863 − 298 =
9. 9.946 − 498 =
10. 10.837 − 497 =
11. 11.734 − 229 =
12. 12.265 − 198 =
13. 13.599 − 519 =
14. 14.483 − 357 =
15. 15.802 − 697 =
16. 16.640 − 599 =
17. 17.932 − 658 =
18. 18.937 − 637 =
19. 19.644 − 498 =
20. 20.906 − 467 =
21. 21.930 − 798 =
22. 22.899 − 599 =
23. 23.940 − 119 =
24. 24.406 − 297 =
25. 25.556 − 247 =
26. 26.748 − 297 =
27. 27.767 − 698 =
28. 28.970 − 499 =
29. 29.763 − 597 =
30. 30.975 − 499 =
31. 31.467 − 399 =
32. 32.623 − 267 =
33. 33.457 − 117 =
34. 34.669 − 599 =
35. 35.509 − 198 =
36. 36.291 − 169 =
37. 37.846 − 669 =
38. 38.987 − 798 =
39. 39.687 − 299 =
40. 40.415 − 199 =

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