Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 130 · 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. 1.848 − 358 =
2. 2.902 − 699 =
3. 3.953 − 797 =
4. 4.722 − 689 =
5. 5.679 − 259 =
6. 6.550 − 499 =
7. 7.249 − 169 =
8. 8.757 − 598 =
9. 9.673 − 498 =
10. 10.527 − 397 =
11. 11.931 − 548 =
12. 12.650 − 617 =
13. 13.900 − 288 =
14. 14.772 − 217 =
15. 15.921 − 198 =
16. 16.542 − 278 =
17. 17.875 − 199 =
18. 18.705 − 297 =
19. 19.673 − 547 =
20. 20.933 − 198 =
21. 21.224 − 198 =
22. 22.623 − 249 =
23. 23.453 − 119 =
24. 24.788 − 498 =
25. 25.950 − 199 =
26. 26.458 − 199 =
27. 27.953 − 289 =
28. 28.768 − 547 =
29. 29.732 − 397 =
30. 30.738 − 408 =
31. 31.525 − 468 =
32. 32.455 − 379 =
33. 33.535 − 299 =
34. 34.616 − 199 =
35. 35.477 − 397 =
36. 36.949 − 797 =
37. 37.662 − 498 =
38. 38.601 − 499 =
39. 39.809 − 198 =
40. 40.867 − 498 =

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