Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 336 · 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 − 599 =
2. 2.595 − 297 =
3. 3.709 − 297 =
4. 4.605 − 498 =
5. 5.504 − 359 =
6. 6.700 − 417 =
7. 7.816 − 697 =
8. 8.980 − 379 =
9. 9.935 − 797 =
10. 10.924 − 657 =
11. 11.829 − 497 =
12. 12.565 − 297 =
13. 13.405 − 199 =
14. 14.857 − 599 =
15. 15.830 − 628 =
16. 16.960 − 797 =
17. 17.863 − 797 =
18. 18.561 − 499 =
19. 19.959 − 798 =
20. 20.391 − 327 =
21. 21.880 − 237 =
22. 22.691 − 468 =
23. 23.807 − 619 =
24. 24.346 − 297 =
25. 25.223 − 198 =
26. 26.902 − 287 =
27. 27.855 − 697 =
28. 28.582 − 219 =
29. 29.871 − 498 =
30. 30.886 − 208 =
31. 31.788 − 497 =
32. 32.968 − 359 =
33. 33.797 − 499 =
34. 34.648 − 597 =
35. 35.306 − 197 =
36. 36.412 − 268 =
37. 37.877 − 699 =
38. 38.803 − 549 =
39. 39.839 − 198 =
40. 40.914 − 297 =

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