3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 791 · 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. 1.477 − 148 =
2. 2.681 + 334 =
3. 3.272 + 471 =
4. 4.844 − 641 =
5. 5.562 + 442 =
6. 6.872 − 562 =
7. 7.476 − 232 =
8. 8.509 − 319 =
9. 9.412 − 214 =
10. 10.537 − 304 =
11. 11.520 + 257 =
12. 12.447 + 642 =
13. 13.442 + 678 =
14. 14.533 − 262 =
15. 15.318 + 498 =
16. 16.939 − 497 =
17. 17.915 − 541 =
18. 18.219 + 269 =
19. 19.498 + 237 =
20. 20.766 − 205 =
21. 21.776 + 425 =
22. 22.515 − 238 =
23. 23.409 + 622 =
24. 24.411 + 153 =
25. 25.597 − 161 =
26. 26.251 + 202 =
27. 27.182 + 419 =
28. 28.554 + 171 =
29. 29.615 + 113 =
30. 30.318 + 255 =
31. 31.590 − 172 =
32. 32.759 + 269 =
33. 33.356 + 615 =
34. 34.576 − 123 =
35. 35.660 − 113 =
36. 36.480 + 435 =
37. 37.666 + 181 =
38. 38.300 + 585 =
39. 39.716 − 466 =
40. 40.313 + 216 =

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