Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 75 · 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. 1.527 − 237 =
2. 2.557 − 539 =
3. 3.849 − 799 =
4. 4.833 − 797 =
5. 5.769 − 499 =
6. 6.394 − 239 =
7. 7.640 − 298 =
8. 8.690 − 398 =
9. 9.873 − 197 =
10. 10.747 − 317 =
11. 11.843 − 798 =
12. 12.975 − 319 =
13. 13.750 − 639 =
14. 14.502 − 429 =
15. 15.899 − 799 =
16. 16.777 − 597 =
17. 17.736 − 378 =
18. 18.721 − 347 =
19. 19.846 − 799 =
20. 20.868 − 399 =
21. 21.518 − 419 =
22. 22.987 − 598 =
23. 23.940 − 289 =
24. 24.452 − 299 =
25. 25.909 − 399 =
26. 26.847 − 518 =
27. 27.722 − 699 =
28. 28.916 − 148 =
29. 29.616 − 498 =
30. 30.968 − 799 =
31. 31.633 − 577 =
32. 32.303 − 249 =
33. 33.858 − 448 =
34. 34.436 − 218 =
35. 35.863 − 697 =
36. 36.306 − 268 =
37. 37.810 − 599 =
38. 38.962 − 588 =
39. 39.682 − 599 =
40. 40.988 − 499 =

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths