3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 36 · 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. 1.818 − 462 =
2. 2.615 − 327 =
3. 3.684 − 528 =
4. 4.494 − 325 =
5. 5.137 + 156 =
6. 6.419 − 216 =
7. 7.195 + 296 =
8. 8.682 + 156 =
9. 9.544 − 279 =
10. 10.733 + 331 =
11. 11.392 + 655 =
12. 12.750 + 195 =
13. 13.746 − 219 =
14. 14.746 − 195 =
15. 15.491 + 123 =
16. 16.218 + 181 =
17. 17.912 − 368 =
18. 18.638 + 671 =
19. 19.593 + 556 =
20. 20.494 − 386 =
21. 21.576 − 471 =
22. 22.883 − 538 =
23. 23.442 − 139 =
24. 24.244 + 191 =
25. 25.740 + 142 =
26. 26.441 + 413 =
27. 27.580 + 629 =
28. 28.358 + 181 =
29. 29.238 + 647 =
30. 30.427 − 221 =
31. 31.864 − 414 =
32. 32.217 + 499 =
33. 33.779 − 421 =
34. 34.705 − 521 =
35. 35.221 + 472 =
36. 36.772 + 246 =
37. 37.430 − 249 =
38. 38.767 + 344 =
39. 39.737 − 284 =
40. 40.762 − 538 =

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