Subtraction by Rounding Worksheet

Mental maths lesson 21: Subtract by rounding up and adding back · Set 266 · 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. 1.541 − 199 =
2. 2.330 − 258 =
3. 3.290 − 197 =
4. 4.775 − 259 =
5. 5.748 − 199 =
6. 6.829 − 298 =
7. 7.884 − 557 =
8. 8.825 − 529 =
9. 9.637 − 599 =
10. 10.888 − 468 =
11. 11.892 − 237 =
12. 12.978 − 327 =
13. 13.772 − 697 =
14. 14.219 − 158 =
15. 15.832 − 299 =
16. 16.930 − 679 =
17. 17.965 − 699 =
18. 18.673 − 619 =
19. 19.342 − 268 =
20. 20.705 − 599 =
21. 21.973 − 399 =
22. 22.708 − 497 =
23. 23.760 − 599 =
24. 24.993 − 798 =
25. 25.630 − 427 =
26. 26.562 − 299 =
27. 27.754 − 499 =
28. 28.734 − 599 =
29. 29.370 − 198 =
30. 30.795 − 298 =
31. 31.513 − 298 =
32. 32.901 − 699 =
33. 33.801 − 698 =
34. 34.998 − 399 =
35. 35.953 − 697 =
36. 36.853 − 509 =
37. 37.473 − 397 =
38. 38.436 − 197 =
39. 39.455 − 399 =
40. 40.235 − 198 =

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