Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 770 · 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. 1.652 − 598 =
2. 2.919 − 699 =
3. 3.953 − 797 =
4. 4.758 − 698 =
5. 5.912 − 197 =
6. 6.781 − 597 =
7. 7.883 − 598 =
8. 8.561 − 527 =
9. 9.268 − 199 =
10. 10.644 − 297 =
11. 11.657 − 537 =
12. 12.523 − 497 =
13. 13.935 − 467 =
14. 14.812 − 798 =
15. 15.911 − 599 =
16. 16.576 − 257 =
17. 17.829 − 357 =
18. 18.666 − 298 =
19. 19.861 − 797 =
20. 20.626 − 259 =
21. 21.678 − 547 =
22. 22.921 − 679 =
23. 23.808 − 637 =
24. 24.661 − 439 =
25. 25.897 − 197 =
26. 26.786 − 698 =
27. 27.952 − 558 =
28. 28.831 − 168 =
29. 29.825 − 659 =
30. 30.979 − 797 =
31. 31.481 − 157 =
32. 32.726 − 329 =
33. 33.769 − 368 =
34. 34.676 − 599 =
35. 35.895 − 627 =
36. 36.616 − 427 =
37. 37.951 − 199 =
38. 38.468 − 297 =
39. 39.355 − 299 =
40. 40.687 − 297 =

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