3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 901 · 40 questions

How to do it in your head (Hundreds first): Keep the first number as it is and split the second into hundreds, tens and ones. Add (or take away) the hundreds first, then the tens. Finish with the ones — bridge through a ten if you need to.

1. 1.981 − 657 =
2. 2.911 − 435 =
3. 3.909 − 706 =
4. 4.605 − 112 =
5. 5.744 − 299 =
6. 6.751 − 183 =
7. 7.818 − 324 =
8. 8.952 − 674 =
9. 9.736 − 227 =
10. 10.523 + 165 =
11. 11.280 + 208 =
12. 12.218 + 677 =
13. 13.718 − 477 =
14. 14.799 − 525 =
15. 15.945 − 729 =
16. 16.185 + 366 =
17. 17.446 + 252 =
18. 18.789 − 546 =
19. 19.612 − 505 =
20. 20.380 + 581 =
21. 21.651 + 643 =
22. 22.711 − 497 =
23. 23.529 + 677 =
24. 24.453 − 181 =
25. 25.504 − 172 =
26. 26.829 − 297 =
27. 27.959 − 751 =
28. 28.655 + 504 =
29. 29.153 + 132 =
30. 30.311 + 306 =
31. 31.785 + 214 =
32. 32.730 − 195 =
33. 33.153 + 128 =
34. 34.809 − 697 =
35. 35.782 + 505 =
36. 36.648 − 123 =
37. 37.416 + 528 =
38. 38.191 + 621 =
39. 39.214 + 565 =
40. 40.676 − 413 =

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