3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 708 · 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. 1.695 + 194 =
2. 2.730 − 418 =
3. 3.913 − 271 =
4. 4.979 − 224 =
5. 5.658 + 315 =
6. 6.933 − 131 =
7. 7.766 − 145 =
8. 8.570 + 119 =
9. 9.214 + 333 =
10. 10.629 + 501 =
11. 11.587 − 233 =
12. 12.637 + 313 =
13. 13.641 − 337 =
14. 14.186 + 524 =
15. 15.315 + 403 =
16. 16.889 − 706 =
17. 17.549 + 181 =
18. 18.280 + 202 =
19. 19.282 + 215 =
20. 20.702 + 441 =
21. 21.626 + 494 =
22. 22.672 + 671 =
23. 23.559 − 118 =
24. 24.953 − 743 =
25. 25.694 − 186 =
26. 26.426 + 505 =
27. 27.646 − 128 =
28. 28.660 + 664 =
29. 29.586 − 237 =
30. 30.471 + 231 =
31. 31.453 − 265 =
32. 32.215 + 544 =
33. 33.329 + 544 =
34. 34.963 − 293 =
35. 35.399 + 326 =
36. 36.969 − 559 =
37. 37.754 + 129 =
38. 38.571 − 195 =
39. 39.770 + 388 =
40. 40.484 − 287 =

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