Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 816 · 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. 1.761 − 697 =
2. 2.814 − 598 =
3. 3.483 − 379 =
4. 4.838 − 299 =
5. 5.771 − 587 =
6. 6.916 − 597 =
7. 7.732 − 468 =
8. 8.801 − 699 =
9. 9.618 − 299 =
10. 10.724 − 249 =
11. 11.297 − 197 =
12. 12.735 − 697 =
13. 13.739 − 619 =
14. 14.839 − 398 =
15. 15.714 − 448 =
16. 16.814 − 799 =
17. 17.563 − 438 =
18. 18.991 − 799 =
19. 19.854 − 798 =
20. 20.690 − 299 =
21. 21.980 − 547 =
22. 22.605 − 199 =
23. 23.605 − 498 =
24. 24.823 − 409 =
25. 25.216 − 198 =
26. 26.327 − 299 =
27. 27.417 − 178 =
28. 28.871 − 599 =
29. 29.973 − 488 =
30. 30.754 − 637 =
31. 31.614 − 298 =
32. 32.902 − 599 =
33. 33.771 − 149 =
34. 34.596 − 197 =
35. 35.962 − 219 =
36. 36.985 − 327 =
37. 37.389 − 208 =
38. 38.839 − 639 =
39. 39.967 − 399 =
40. 40.911 − 598 =

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