Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 204 · 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. 1.652 − 499 =
2. 2.722 − 197 =
3. 3.705 − 598 =
4. 4.647 − 399 =
5. 5.894 − 699 =
6. 6.735 − 397 =
7. 7.884 − 299 =
8. 8.551 − 297 =
9. 9.525 − 497 =
10. 10.735 − 497 =
11. 11.341 − 198 =
12. 12.758 − 597 =
13. 13.703 − 358 =
14. 14.737 − 599 =
15. 15.973 − 697 =
16. 16.491 − 347 =
17. 17.683 − 488 =
18. 18.837 − 197 =
19. 19.857 − 549 =
20. 20.806 − 649 =
21. 21.828 − 697 =
22. 22.977 − 319 =
23. 23.441 − 418 =
24. 24.769 − 308 =
25. 25.346 − 238 =
26. 26.675 − 559 =
27. 27.930 − 798 =
28. 28.704 − 569 =
29. 29.904 − 449 =
30. 30.813 − 597 =
31. 31.799 − 608 =
32. 32.581 − 398 =
33. 33.856 − 698 =
34. 34.286 − 127 =
35. 35.667 − 298 =
36. 36.903 − 589 =
37. 37.930 − 619 =
38. 38.729 − 188 =
39. 39.985 − 299 =
40. 40.674 − 298 =

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