3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 883 · 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. 1.190 + 501 =
2. 2.431 + 323 =
3. 3.723 − 511 =
4. 4.614 − 504 =
5. 5.440 − 113 =
6. 6.436 − 291 =
7. 7.252 + 333 =
8. 8.345 + 641 =
9. 9.508 + 594 =
10. 10.283 + 497 =
11. 11.573 − 171 =
12. 12.183 + 649 =
13. 13.567 − 268 =
14. 14.715 + 541 =
15. 15.533 − 221 =
16. 16.251 + 464 =
17. 17.165 + 401 =
18. 18.701 + 373 =
19. 19.759 + 378 =
20. 20.270 + 509 =
21. 21.900 − 506 =
22. 22.966 − 379 =
23. 23.297 + 598 =
24. 24.779 + 481 =
25. 25.493 − 281 =
26. 26.728 − 583 =
27. 27.149 + 689 =
28. 28.729 + 558 =
29. 29.659 + 604 =
30. 30.650 + 567 =
31. 31.244 + 514 =
32. 32.460 − 169 =
33. 33.487 + 151 =
34. 34.479 + 652 =
35. 35.746 − 269 =
36. 36.742 + 473 =
37. 37.981 − 598 =
38. 38.812 − 431 =
39. 39.614 + 469 =
40. 40.559 − 425 =

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