3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 130 · 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. 1.686 − 398 =
2. 2.713 − 511 =
3. 3.901 − 491 =
4. 4.748 − 366 =
5. 5.289 + 601 =
6. 6.566 − 407 =
7. 7.269 + 487 =
8. 8.474 − 121 =
9. 9.674 − 368 =
10. 10.785 + 205 =
11. 11.531 − 341 =
12. 12.780 − 593 =
13. 13.848 − 186 =
14. 14.574 − 296 =
15. 15.486 − 271 =
16. 16.293 + 178 =
17. 17.384 + 214 =
18. 18.582 − 317 =
19. 19.436 + 289 =
20. 20.414 − 142 =
21. 21.523 − 264 =
22. 22.221 + 346 =
23. 23.756 + 491 =
24. 24.976 − 852 =
25. 25.637 − 144 =
26. 26.312 + 377 =
27. 27.473 − 181 =
28. 28.676 − 564 =
29. 29.472 + 133 =
30. 30.927 − 394 =
31. 31.646 − 184 =
32. 32.822 − 525 =
33. 33.276 + 119 =
34. 34.894 − 638 =
35. 35.943 − 369 =
36. 36.262 + 533 =
37. 37.330 + 667 =
38. 38.514 + 256 =
39. 39.793 − 118 =
40. 40.949 − 777 =

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