Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 93 · 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. 1.765 − 199 =
2. 2.873 − 697 =
3. 3.266 − 208 =
4. 4.996 − 649 =
5. 5.929 − 197 =
6. 6.795 − 498 =
7. 7.979 − 238 =
8. 8.726 − 537 =
9. 9.911 − 627 =
10. 10.815 − 518 =
11. 11.877 − 569 =
12. 12.826 − 599 =
13. 13.608 − 199 =
14. 14.685 − 479 =
15. 15.824 − 797 =
16. 16.629 − 529 =
17. 17.465 − 299 =
18. 18.922 − 798 =
19. 19.619 − 588 =
20. 20.794 − 658 =
21. 21.876 − 278 =
22. 22.945 − 297 =
23. 23.825 − 597 =
24. 24.935 − 577 =
25. 25.769 − 697 =
26. 26.618 − 199 =
27. 27.747 − 137 =
28. 28.433 − 249 =
29. 29.517 − 217 =
30. 30.400 − 199 =
31. 31.941 − 558 =
32. 32.903 − 498 =
33. 33.687 − 588 =
34. 34.504 − 399 =
35. 35.631 − 399 =
36. 36.567 − 499 =
37. 37.852 − 199 =
38. 38.939 − 687 =
39. 39.908 − 217 =
40. 40.931 − 398 =

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