Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 267 · 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. 1.849 − 697 =
2. 2.973 − 499 =
3. 3.530 − 318 =
4. 4.708 − 397 =
5. 5.984 − 697 =
6. 6.921 − 698 =
7. 7.958 − 657 =
8. 8.857 − 699 =
9. 9.929 − 399 =
10. 10.846 − 207 =
11. 11.264 − 247 =
12. 12.902 − 297 =
13. 13.797 − 597 =
14. 14.384 − 168 =
15. 15.937 − 397 =
16. 16.420 − 298 =
17. 17.775 − 479 =
18. 18.673 − 127 =
19. 19.874 − 797 =
20. 20.620 − 498 =
21. 21.253 − 137 =
22. 22.941 − 468 =
23. 23.813 − 698 =
24. 24.430 − 208 =
25. 25.773 − 497 =
26. 26.928 − 449 =
27. 27.939 − 677 =
28. 28.662 − 499 =
29. 29.280 − 197 =
30. 30.882 − 497 =
31. 31.283 − 199 =
32. 32.292 − 199 =
33. 33.640 − 578 =
34. 34.966 − 298 =
35. 35.402 − 328 =
36. 36.861 − 208 =
37. 37.843 − 799 =
38. 38.794 − 628 =
39. 39.334 − 297 =
40. 40.944 − 639 =

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