3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 437 · 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. 1.441 − 183 =
2. 2.476 − 302 =
3. 3.790 − 569 =
4. 4.237 + 325 =
5. 5.700 − 578 =
6. 6.686 − 274 =
7. 7.770 + 402 =
8. 8.769 + 242 =
9. 9.970 − 864 =
10. 10.304 + 151 =
11. 11.347 + 603 =
12. 12.560 − 386 =
13. 13.906 − 512 =
14. 14.357 + 476 =
15. 15.446 − 227 =
16. 16.941 − 407 =
17. 17.346 + 158 =
18. 18.657 − 303 =
19. 19.629 + 418 =
20. 20.597 + 366 =
21. 21.759 + 664 =
22. 22.167 + 146 =
23. 23.202 + 666 =
24. 24.382 + 123 =
25. 25.518 − 329 =
26. 26.493 − 341 =
27. 27.719 − 355 =
28. 28.606 + 437 =
29. 29.843 − 674 =
30. 30.985 − 172 =
31. 31.778 − 246 =
32. 32.774 − 116 =
33. 33.611 + 505 =
34. 34.588 + 551 =
35. 35.332 + 247 =
36. 36.673 − 121 =
37. 37.395 + 624 =
38. 38.903 − 234 =
39. 39.423 − 151 =
40. 40.684 + 527 =

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