Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 996 · 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. 1.296 − 198 =
2. 2.460 − 368 =
3. 3.605 − 299 =
4. 4.626 − 577 =
5. 5.950 − 248 =
6. 6.844 − 797 =
7. 7.383 − 228 =
8. 8.912 − 379 =
9. 9.981 − 548 =
10. 10.449 − 398 =
11. 11.826 − 199 =
12. 12.784 − 449 =
13. 13.372 − 299 =
14. 14.860 − 797 =
15. 15.929 − 699 =
16. 16.916 − 519 =
17. 17.745 − 197 =
18. 18.604 − 268 =
19. 19.692 − 199 =
20. 20.545 − 227 =
21. 21.375 − 298 =
22. 22.554 − 389 =
23. 23.663 − 249 =
24. 24.962 − 697 =
25. 25.880 − 498 =
26. 26.706 − 488 =
27. 27.588 − 329 =
28. 28.554 − 398 =
29. 29.348 − 299 =
30. 30.862 − 657 =
31. 31.890 − 477 =
32. 32.723 − 249 =
33. 33.781 − 198 =
34. 34.874 − 797 =
35. 35.837 − 499 =
36. 36.578 − 298 =
37. 37.636 − 568 =
38. 38.502 − 297 =
39. 39.731 − 528 =
40. 40.513 − 407 =

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