Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 886 · 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. 1.534 − 228 =
2. 2.949 − 629 =
3. 3.538 − 157 =
4. 4.411 − 169 =
5. 5.894 − 798 =
6. 6.852 − 298 =
7. 7.407 − 277 =
8. 8.741 − 647 =
9. 9.890 − 208 =
10. 10.807 − 499 =
11. 11.675 − 259 =
12. 12.834 − 697 =
13. 13.819 − 589 =
14. 14.366 − 198 =
15. 15.849 − 248 =
16. 16.829 − 399 =
17. 17.719 − 628 =
18. 18.962 − 657 =
19. 19.919 − 677 =
20. 20.807 − 497 =
21. 21.331 − 299 =
22. 22.558 − 298 =
23. 23.577 − 297 =
24. 24.827 − 637 =
25. 25.423 − 329 =
26. 26.636 − 367 =
27. 27.605 − 497 =
28. 28.772 − 509 =
29. 29.707 − 677 =
30. 30.760 − 699 =
31. 31.988 − 679 =
32. 32.458 − 298 =
33. 33.499 − 298 =
34. 34.759 − 269 =
35. 35.744 − 498 =
36. 36.845 − 537 =
37. 37.573 − 179 =
38. 38.885 − 199 =
39. 39.720 − 697 =
40. 40.719 − 629 =

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