3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 752 · 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. 1.469 − 281 =
2. 2.683 + 472 =
3. 3.535 + 224 =
4. 4.850 − 251 =
5. 5.758 − 283 =
6. 6.462 + 115 =
7. 7.622 + 503 =
8. 8.591 − 286 =
9. 9.750 + 311 =
10. 10.369 + 259 =
11. 11.739 − 529 =
12. 12.568 − 115 =
13. 13.276 + 328 =
14. 14.965 − 503 =
15. 15.496 + 198 =
16. 16.682 − 303 =
17. 17.492 − 257 =
18. 18.814 − 285 =
19. 19.449 − 139 =
20. 20.476 + 385 =
21. 21.575 + 395 =
22. 22.571 − 471 =
23. 23.946 − 726 =
24. 24.747 − 543 =
25. 25.868 − 587 =
26. 26.891 − 701 =
27. 27.969 − 415 =
28. 28.896 − 118 =
29. 29.275 + 554 =
30. 30.931 − 529 =
31. 31.929 − 241 =
32. 32.438 − 238 =
33. 33.948 − 471 =
34. 34.717 − 401 =
35. 35.637 + 576 =
36. 36.362 + 268 =
37. 37.918 − 387 =
38. 38.503 + 281 =
39. 39.731 − 517 =
40. 40.603 − 363 =

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