3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 964 · 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. 1.414 − 222 =
2. 2.498 + 311 =
3. 3.887 − 404 =
4. 4.481 − 121 =
5. 5.725 − 238 =
6. 6.598 − 421 =
7. 7.606 + 466 =
8. 8.167 + 404 =
9. 9.593 − 204 =
10. 10.913 − 776 =
11. 11.475 − 181 =
12. 12.495 − 232 =
13. 13.141 + 118 =
14. 14.767 − 375 =
15. 15.761 + 378 =
16. 16.786 − 352 =
17. 17.478 + 487 =
18. 18.513 + 394 =
19. 19.175 + 641 =
20. 20.399 + 345 =
21. 21.967 − 365 =
22. 22.746 + 321 =
23. 23.825 − 438 =
24. 24.356 + 645 =
25. 25.989 − 451 =
26. 26.690 + 314 =
27. 27.493 − 306 =
28. 28.686 − 476 =
29. 29.771 + 179 =
30. 30.538 − 221 =
31. 31.660 + 258 =
32. 32.311 + 571 =
33. 33.591 − 409 =
34. 34.231 + 283 =
35. 35.839 − 611 =
36. 36.417 + 194 =
37. 37.179 + 217 =
38. 38.127 + 567 =
39. 39.162 + 185 =
40. 40.627 + 362 =

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