3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 374 · 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. 1.460 − 211 =
2. 2.765 − 264 =
3. 3.412 − 194 =
4. 4.681 − 341 =
5. 5.598 + 458 =
6. 6.632 − 439 =
7. 7.771 − 333 =
8. 8.472 − 171 =
9. 9.547 + 407 =
10. 10.183 + 184 =
11. 11.320 + 511 =
12. 12.534 − 321 =
13. 13.129 + 184 =
14. 14.696 − 422 =
15. 15.450 − 138 =
16. 16.754 − 641 =
17. 17.450 − 337 =
18. 18.620 + 501 =
19. 19.560 − 273 =
20. 20.730 + 167 =
21. 21.596 + 539 =
22. 22.704 − 599 =
23. 23.835 − 519 =
24. 24.472 + 541 =
25. 25.685 − 144 =
26. 26.721 − 401 =
27. 27.461 + 285 =
28. 28.186 + 673 =
29. 29.940 − 517 =
30. 30.854 − 716 =
31. 31.461 − 259 =
32. 32.123 + 319 =
33. 33.588 − 293 =
34. 34.269 + 478 =
35. 35.953 − 738 =
36. 36.223 + 388 =
37. 37.519 − 194 =
38. 38.420 + 145 =
39. 39.387 + 562 =
40. 40.625 − 307 =

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