Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 583 · 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. 1.467 − 199 =
2. 2.876 − 259 =
3. 3.620 − 347 =
4. 4.798 − 297 =
5. 5.554 − 197 =
6. 6.314 − 299 =
7. 7.629 − 237 =
8. 8.942 − 698 =
9. 9.593 − 409 =
10. 10.570 − 128 =
11. 11.605 − 528 =
12. 12.797 − 328 =
13. 13.980 − 197 =
14. 14.740 − 318 =
15. 15.824 − 298 =
16. 16.634 − 598 =
17. 17.819 − 498 =
18. 18.440 − 129 =
19. 19.691 − 637 =
20. 20.875 − 799 =
21. 21.713 − 318 =
22. 22.954 − 799 =
23. 23.563 − 197 =
24. 24.697 − 499 =
25. 25.878 − 797 =
26. 26.220 − 167 =
27. 27.267 − 197 =
28. 28.874 − 298 =
29. 29.557 − 377 =
30. 30.795 − 598 =
31. 31.917 − 618 =
32. 32.345 − 268 =
33. 33.479 − 289 =
34. 34.315 − 297 =
35. 35.633 − 599 =
36. 36.904 − 798 =
37. 37.420 − 317 =
38. 38.729 − 347 =
39. 39.786 − 467 =
40. 40.785 − 168 =

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