3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 947 · 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. 1.980 − 526 =
2. 2.582 − 462 =
3. 3.400 + 149 =
4. 4.502 − 378 =
5. 5.290 + 136 =
6. 6.627 + 223 =
7. 7.715 + 456 =
8. 8.532 − 358 =
9. 9.538 − 217 =
10. 10.309 + 443 =
11. 11.358 + 473 =
12. 12.539 − 432 =
13. 13.472 − 142 =
14. 14.485 − 363 =
15. 15.874 − 567 =
16. 16.591 − 221 =
17. 17.355 + 394 =
18. 18.730 + 681 =
19. 19.841 − 717 =
20. 20.286 + 257 =
21. 21.878 − 621 =
22. 22.549 − 119 =
23. 23.200 + 246 =
24. 24.361 + 316 =
25. 25.893 − 691 =
26. 26.530 + 443 =
27. 27.378 + 247 =
28. 28.672 − 229 =
29. 29.548 + 457 =
30. 30.336 + 679 =
31. 31.592 − 321 =
32. 32.244 + 594 =
33. 33.433 − 155 =
34. 34.751 + 413 =
35. 35.491 + 252 =
36. 36.723 − 305 =
37. 37.531 − 365 =
38. 38.448 + 301 =
39. 39.553 − 178 =
40. 40.142 + 391 =

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