3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 398 · 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. 1.962 − 696 =
2. 2.612 + 486 =
3. 3.362 + 551 =
4. 4.128 + 177 =
5. 5.145 + 159 =
6. 6.629 − 183 =
7. 7.386 + 114 =
8. 8.564 + 213 =
9. 9.432 − 328 =
10. 10.715 + 474 =
11. 11.635 − 192 =
12. 12.650 + 453 =
13. 13.955 − 328 =
14. 14.557 + 634 =
15. 15.746 − 468 =
16. 16.278 + 611 =
17. 17.837 − 287 =
18. 18.870 − 232 =
19. 19.650 − 364 =
20. 20.231 + 549 =
21. 21.710 − 509 =
22. 22.766 − 249 =
23. 23.742 + 637 =
24. 24.930 − 139 =
25. 25.636 + 269 =
26. 26.446 − 317 =
27. 27.216 + 201 =
28. 28.590 − 437 =
29. 29.718 + 314 =
30. 30.529 + 131 =
31. 31.761 + 294 =
32. 32.338 + 441 =
33. 33.625 − 212 =
34. 34.781 − 674 =
35. 35.676 − 228 =
36. 36.424 + 424 =
37. 37.843 − 187 =
38. 38.331 + 661 =
39. 39.499 + 504 =
40. 40.460 − 345 =

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