3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 167 · 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. 1.281 + 441 =
2. 2.964 − 541 =
3. 3.640 + 438 =
4. 4.616 − 135 =
5. 5.379 + 559 =
6. 6.685 − 481 =
7. 7.520 − 386 =
8. 8.601 + 561 =
9. 9.978 − 221 =
10. 10.602 − 444 =
11. 11.688 + 597 =
12. 12.666 − 174 =
13. 13.665 − 437 =
14. 14.722 − 603 =
15. 15.550 − 441 =
16. 16.413 + 629 =
17. 17.688 − 413 =
18. 18.442 + 316 =
19. 19.645 − 166 =
20. 20.958 − 464 =
21. 21.869 − 307 =
22. 22.541 − 229 =
23. 23.488 − 193 =
24. 24.466 + 631 =
25. 25.379 + 234 =
26. 26.523 + 625 =
27. 27.641 − 333 =
28. 28.393 + 601 =
29. 29.628 − 175 =
30. 30.634 − 194 =
31. 31.483 − 228 =
32. 32.501 − 143 =
33. 33.385 + 361 =
34. 34.459 + 527 =
35. 35.733 − 345 =
36. 36.647 + 245 =
37. 37.883 − 491 =
38. 38.880 − 261 =
39. 39.142 + 571 =
40. 40.690 − 348 =

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