Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 280 · 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. 1.229 − 197 =
2. 2.988 − 689 =
3. 3.918 − 797 =
4. 4.444 − 327 =
5. 5.835 − 699 =
6. 6.894 − 449 =
7. 7.787 − 398 =
8. 8.282 − 229 =
9. 9.661 − 597 =
10. 10.592 − 498 =
11. 11.418 − 197 =
12. 12.284 − 198 =
13. 13.747 − 438 =
14. 14.727 − 687 =
15. 15.370 − 299 =
16. 16.976 − 149 =
17. 17.971 − 117 =
18. 18.880 − 528 =
19. 19.563 − 429 =
20. 20.968 − 199 =
21. 21.877 − 437 =
22. 22.707 − 169 =
23. 23.563 − 298 =
24. 24.959 − 297 =
25. 25.220 − 188 =
26. 26.412 − 199 =
27. 27.835 − 698 =
28. 28.838 − 649 =
29. 29.934 − 799 =
30. 30.941 − 198 =
31. 31.689 − 599 =
32. 32.622 − 299 =
33. 33.314 − 147 =
34. 34.653 − 399 =
35. 35.855 − 497 =
36. 36.638 − 239 =
37. 37.465 − 297 =
38. 38.718 − 329 =
39. 39.907 − 797 =
40. 40.521 − 418 =

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