Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 90 · 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. 1.706 − 567 =
2. 2.399 − 257 =
3. 3.781 − 697 =
4. 4.984 − 699 =
5. 5.587 − 539 =
6. 6.629 − 267 =
7. 7.385 − 297 =
8. 8.863 − 697 =
9. 9.662 − 318 =
10. 10.618 − 598 =
11. 11.935 − 799 =
12. 12.227 − 198 =
13. 13.809 − 138 =
14. 14.293 − 118 =
15. 15.887 − 597 =
16. 16.913 − 598 =
17. 17.818 − 497 =
18. 18.455 − 409 =
19. 19.925 − 308 =
20. 20.777 − 539 =
21. 21.875 − 538 =
22. 22.973 − 667 =
23. 23.793 − 638 =
24. 24.905 − 597 =
25. 25.737 − 497 =
26. 26.800 − 499 =
27. 27.785 − 698 =
28. 28.703 − 599 =
29. 29.696 − 198 =
30. 30.604 − 299 =
31. 31.912 − 498 =
32. 32.748 − 497 =
33. 33.837 − 597 =
34. 34.326 − 198 =
35. 35.872 − 398 =
36. 36.566 − 119 =
37. 37.979 − 798 =
38. 38.629 − 378 =
39. 39.931 − 269 =
40. 40.908 − 798 =

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