Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 691 · 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. 1.976 − 698 =
2. 2.806 − 197 =
3. 3.412 − 319 =
4. 4.931 − 397 =
5. 5.746 − 477 =
6. 6.772 − 668 =
7. 7.852 − 797 =
8. 8.871 − 199 =
9. 9.771 − 298 =
10. 10.820 − 799 =
11. 11.909 − 599 =
12. 12.779 − 697 =
13. 13.739 − 497 =
14. 14.804 − 247 =
15. 15.653 − 499 =
16. 16.789 − 598 =
17. 17.859 − 699 =
18. 18.854 − 797 =
19. 19.281 − 197 =
20. 20.439 − 299 =
21. 21.513 − 399 =
22. 22.988 − 588 =
23. 23.438 − 248 =
24. 24.731 − 598 =
25. 25.753 − 599 =
26. 26.816 − 797 =
27. 27.634 − 498 =
28. 28.496 − 408 =
29. 29.964 − 397 =
30. 30.670 − 149 =
31. 31.744 − 359 =
32. 32.881 − 467 =
33. 33.563 − 197 =
34. 34.972 − 117 =
35. 35.985 − 397 =
36. 36.829 − 428 =
37. 37.642 − 519 =
38. 38.836 − 398 =
39. 39.927 − 119 =
40. 40.808 − 599 =

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