Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 14 · 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. 1.977 − 697 =
2. 2.950 − 269 =
3. 3.358 − 197 =
4. 4.928 − 167 =
5. 5.954 − 419 =
6. 6.709 − 597 =
7. 7.747 − 597 =
8. 8.555 − 299 =
9. 9.600 − 298 =
10. 10.380 − 349 =
11. 11.944 − 407 =
12. 12.594 − 558 =
13. 13.569 − 457 =
14. 14.399 − 339 =
15. 15.698 − 599 =
16. 16.714 − 397 =
17. 17.461 − 198 =
18. 18.797 − 398 =
19. 19.194 − 177 =
20. 20.944 − 568 =
21. 21.355 − 327 =
22. 22.516 − 478 =
23. 23.897 − 697 =
24. 24.932 − 699 =
25. 25.832 − 798 =
26. 26.676 − 599 =
27. 27.337 − 297 =
28. 28.724 − 697 =
29. 29.548 − 167 =
30. 30.415 − 399 =
31. 31.798 − 477 =
32. 32.782 − 629 =
33. 33.757 − 298 =
34. 34.914 − 399 =
35. 35.522 − 498 =
36. 36.764 − 667 =
37. 37.706 − 328 =
38. 38.674 − 519 =
39. 39.973 − 497 =
40. 40.883 − 798 =

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