Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 762 · 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. 1.773 − 219 =
2. 2.562 − 479 =
3. 3.860 − 349 =
4. 4.902 − 797 =
5. 5.890 − 499 =
6. 6.866 − 597 =
7. 7.228 − 199 =
8. 8.786 − 697 =
9. 9.835 − 297 =
10. 10.977 − 297 =
11. 11.801 − 499 =
12. 12.941 − 299 =
13. 13.930 − 797 =
14. 14.935 − 299 =
15. 15.807 − 698 =
16. 16.722 − 698 =
17. 17.581 − 199 =
18. 18.607 − 467 =
19. 19.714 − 199 =
20. 20.801 − 197 =
21. 21.718 − 699 =
22. 22.963 − 689 =
23. 23.542 − 498 =
24. 24.906 − 439 =
25. 25.830 − 189 =
26. 26.387 − 289 =
27. 27.758 − 499 =
28. 28.900 − 308 =
29. 29.405 − 187 =
30. 30.665 − 549 =
31. 31.866 − 409 =
32. 32.920 − 699 =
33. 33.860 − 288 =
34. 34.756 − 608 =
35. 35.495 − 397 =
36. 36.378 − 197 =
37. 37.917 − 799 =
38. 38.360 − 297 =
39. 39.780 − 399 =
40. 40.707 − 259 =

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