Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 197 · 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. 1.806 − 197 =
2. 2.402 − 199 =
3. 3.992 − 598 =
4. 4.940 − 398 =
5. 5.818 − 198 =
6. 6.940 − 368 =
7. 7.849 − 569 =
8. 8.846 − 627 =
9. 9.942 − 697 =
10. 10.924 − 598 =
11. 11.399 − 118 =
12. 12.770 − 699 =
13. 13.622 − 569 =
14. 14.353 − 199 =
15. 15.928 − 398 =
16. 16.845 − 198 =
17. 17.757 − 257 =
18. 18.446 − 299 =
19. 19.497 − 298 =
20. 20.536 − 438 =
21. 21.554 − 399 =
22. 22.771 − 597 =
23. 23.957 − 499 =
24. 24.994 − 799 =
25. 25.813 − 197 =
26. 26.383 − 218 =
27. 27.699 − 597 =
28. 28.435 − 298 =
29. 29.850 − 539 =
30. 30.910 − 648 =
31. 31.934 − 798 =
32. 32.752 − 488 =
33. 33.781 − 299 =
34. 34.902 − 699 =
35. 35.960 − 547 =
36. 36.819 − 797 =
37. 37.362 − 238 =
38. 38.986 − 299 =
39. 39.952 − 797 =
40. 40.736 − 197 =

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