Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 654 · 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. 1.891 − 698 =
2. 2.654 − 567 =
3. 3.992 − 208 =
4. 4.497 − 298 =
5. 5.877 − 489 =
6. 6.922 − 199 =
7. 7.971 − 597 =
8. 8.407 − 198 =
9. 9.683 − 469 =
10. 10.568 − 487 =
11. 11.853 − 497 =
12. 12.188 − 128 =
13. 13.887 − 699 =
14. 14.973 − 649 =
15. 15.967 − 467 =
16. 16.858 − 597 =
17. 17.782 − 197 =
18. 18.283 − 188 =
19. 19.731 − 297 =
20. 20.996 − 688 =
21. 21.679 − 438 =
22. 22.639 − 597 =
23. 23.771 − 379 =
24. 24.826 − 799 =
25. 25.477 − 138 =
26. 26.940 − 559 =
27. 27.795 − 579 =
28. 28.730 − 559 =
29. 29.602 − 208 =
30. 30.365 − 278 =
31. 31.909 − 797 =
32. 32.667 − 597 =
33. 33.892 − 697 =
34. 34.695 − 387 =
35. 35.781 − 699 =
36. 36.946 − 249 =
37. 37.410 − 298 =
38. 38.947 − 347 =
39. 39.660 − 597 =
40. 40.471 − 227 =

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