Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 686 · 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. 1.483 − 348 =
2. 2.915 − 197 =
3. 3.812 − 679 =
4. 4.511 − 409 =
5. 5.969 − 199 =
6. 6.757 − 398 =
7. 7.370 − 319 =
8. 8.925 − 489 =
9. 9.849 − 689 =
10. 10.402 − 199 =
11. 11.866 − 799 =
12. 12.673 − 599 =
13. 13.313 − 179 =
14. 14.827 − 439 =
15. 15.262 − 197 =
16. 16.920 − 499 =
17. 17.578 − 209 =
18. 18.747 − 578 =
19. 19.690 − 597 =
20. 20.793 − 127 =
21. 21.540 − 429 =
22. 22.793 − 698 =
23. 23.669 − 258 =
24. 24.936 − 198 =
25. 25.821 − 229 =
26. 26.823 − 387 =
27. 27.844 − 499 =
28. 28.565 − 507 =
29. 29.940 − 609 =
30. 30.696 − 258 =
31. 31.663 − 278 =
32. 32.586 − 498 =
33. 33.498 − 399 =
34. 34.812 − 598 =
35. 35.716 − 399 =
36. 36.847 − 419 =
37. 37.835 − 297 =
38. 38.696 − 578 =
39. 39.790 − 237 =
40. 40.594 − 489 =

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