Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 656 · 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. 1.864 − 327 =
2. 2.736 − 697 =
3. 3.961 − 797 =
4. 4.881 − 397 =
5. 5.823 − 557 =
6. 6.563 − 197 =
7. 7.674 − 497 =
8. 8.619 − 498 =
9. 9.845 − 688 =
10. 10.660 − 499 =
11. 11.500 − 398 =
12. 12.691 − 499 =
13. 13.673 − 457 =
14. 14.779 − 698 =
15. 15.840 − 549 =
16. 16.708 − 198 =
17. 17.946 − 197 =
18. 18.890 − 598 =
19. 19.295 − 189 =
20. 20.530 − 298 =
21. 21.335 − 297 =
22. 22.240 − 197 =
23. 23.776 − 599 =
24. 24.865 − 568 =
25. 25.672 − 628 =
26. 26.777 − 399 =
27. 27.694 − 158 =
28. 28.958 − 797 =
29. 29.950 − 799 =
30. 30.352 − 199 =
31. 31.363 − 297 =
32. 32.913 − 699 =
33. 33.816 − 798 =
34. 34.515 − 128 =
35. 35.271 − 127 =
36. 36.455 − 397 =
37. 37.671 − 497 =
38. 38.617 − 459 =
39. 39.856 − 517 =
40. 40.458 − 268 =

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