Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 67 · 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. 1.406 − 327 =
2. 2.916 − 677 =
3. 3.941 − 299 =
4. 4.979 − 159 =
5. 5.653 − 498 =
6. 6.431 − 297 =
7. 7.836 − 158 =
8. 8.556 − 398 =
9. 9.637 − 398 =
10. 10.913 − 299 =
11. 11.602 − 538 =
12. 12.975 − 297 =
13. 13.810 − 228 =
14. 14.621 − 278 =
15. 15.891 − 198 =
16. 16.522 − 289 =
17. 17.660 − 599 =
18. 18.688 − 198 =
19. 19.891 − 697 =
20. 20.449 − 198 =
21. 21.614 − 328 =
22. 22.682 − 199 =
23. 23.869 − 697 =
24. 24.501 − 337 =
25. 25.494 − 397 =
26. 26.584 − 169 =
27. 27.975 − 799 =
28. 28.725 − 657 =
29. 29.814 − 799 =
30. 30.882 − 499 =
31. 31.703 − 198 =
32. 32.548 − 297 =
33. 33.769 − 397 =
34. 34.954 − 698 =
35. 35.631 − 398 =
36. 36.437 − 297 =
37. 37.306 − 127 =
38. 38.784 − 499 =
39. 39.652 − 198 =
40. 40.927 − 457 =

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