3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 923 · 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. 1.607 − 439 =
2. 2.462 − 218 =
3. 3.571 + 242 =
4. 4.848 − 261 =
5. 5.705 + 582 =
6. 6.345 + 309 =
7. 7.134 + 582 =
8. 8.544 − 259 =
9. 9.759 − 237 =
10. 10.986 − 769 =
11. 11.932 − 212 =
12. 12.639 + 308 =
13. 13.440 − 127 =
14. 14.856 − 433 =
15. 15.143 + 213 =
16. 16.778 + 351 =
17. 17.366 + 161 =
18. 18.713 − 366 =
19. 19.511 − 162 =
20. 20.555 − 158 =
21. 21.734 − 381 =
22. 22.771 − 439 =
23. 23.413 + 676 =
24. 24.763 − 467 =
25. 25.499 − 198 =
26. 26.519 − 349 =
27. 27.533 − 213 =
28. 28.614 + 686 =
29. 29.265 + 228 =
30. 30.821 − 575 =
31. 31.713 − 386 =
32. 32.433 − 308 =
33. 33.257 + 362 =
34. 34.255 + 331 =
35. 35.535 − 349 =
36. 36.558 − 204 =
37. 37.688 − 181 =
38. 38.640 + 538 =
39. 39.944 − 825 =
40. 40.343 + 335 =

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