3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 971 · 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. 1.467 − 265 =
2. 2.964 − 581 =
3. 3.303 + 412 =
4. 4.635 + 419 =
5. 5.750 − 141 =
6. 6.634 − 174 =
7. 7.712 − 405 =
8. 8.915 − 462 =
9. 9.401 + 352 =
10. 10.550 + 229 =
11. 11.438 − 314 =
12. 12.587 − 162 =
13. 13.503 − 285 =
14. 14.344 + 439 =
15. 15.578 − 364 =
16. 16.563 + 521 =
17. 17.185 + 228 =
18. 18.426 − 243 =
19. 19.503 + 381 =
20. 20.397 + 555 =
21. 21.726 + 662 =
22. 22.795 − 233 =
23. 23.900 − 201 =
24. 24.511 − 368 =
25. 25.580 − 167 =
26. 26.823 − 233 =
27. 27.815 − 263 =
28. 28.778 + 223 =
29. 29.649 + 451 =
30. 30.686 − 306 =
31. 31.556 − 255 =
32. 32.534 + 503 =
33. 33.551 − 271 =
34. 34.979 − 242 =
35. 35.582 + 152 =
36. 36.153 + 609 =
37. 37.494 − 356 =
38. 38.722 − 338 =
39. 39.957 − 281 =
40. 40.850 − 118 =

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