Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 755 · 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. 1.983 − 798 =
2. 2.399 − 199 =
3. 3.976 − 299 =
4. 4.522 − 199 =
5. 5.342 − 199 =
6. 6.626 − 398 =
7. 7.608 − 499 =
8. 8.889 − 799 =
9. 9.826 − 697 =
10. 10.934 − 798 =
11. 11.468 − 357 =
12. 12.841 − 799 =
13. 13.270 − 197 =
14. 14.610 − 567 =
15. 15.772 − 508 =
16. 16.979 − 648 =
17. 17.591 − 217 =
18. 18.895 − 497 =
19. 19.694 − 398 =
20. 20.869 − 699 =
21. 21.804 − 627 =
22. 22.737 − 689 =
23. 23.693 − 598 =
24. 24.381 − 178 =
25. 25.818 − 287 =
26. 26.674 − 587 =
27. 27.961 − 698 =
28. 28.591 − 397 =
29. 29.554 − 169 =
30. 30.587 − 238 =
31. 31.652 − 398 =
32. 32.853 − 799 =
33. 33.447 − 399 =
34. 34.855 − 797 =
35. 35.829 − 799 =
36. 36.784 − 699 =
37. 37.719 − 668 =
38. 38.931 − 397 =
39. 39.910 − 697 =
40. 40.925 − 597 =

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