Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 453 · 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. 1.627 − 199 =
2. 2.777 − 299 =
3. 3.760 − 469 =
4. 4.944 − 537 =
5. 5.473 − 397 =
6. 6.960 − 298 =
7. 7.828 − 697 =
8. 8.326 − 129 =
9. 9.457 − 369 =
10. 10.414 − 247 =
11. 11.874 − 499 =
12. 12.802 − 199 =
13. 13.664 − 439 =
14. 14.651 − 449 =
15. 15.892 − 798 =
16. 16.689 − 499 =
17. 17.896 − 697 =
18. 18.776 − 699 =
19. 19.671 − 588 =
20. 20.664 − 168 =
21. 21.890 − 599 =
22. 22.600 − 297 =
23. 23.541 − 398 =
24. 24.890 − 699 =
25. 25.855 − 598 =
26. 26.928 − 209 =
27. 27.711 − 127 =
28. 28.995 − 649 =
29. 29.364 − 327 =
30. 30.981 − 688 =
31. 31.224 − 199 =
32. 32.707 − 167 =
33. 33.770 − 497 =
34. 34.825 − 798 =
35. 35.826 − 597 =
36. 36.681 − 247 =
37. 37.575 − 199 =
38. 38.328 − 217 =
39. 39.880 − 398 =
40. 40.314 − 297 =

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