3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 616 · 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. 1.456 − 196 =
2. 2.642 − 424 =
3. 3.144 + 371 =
4. 4.693 − 533 =
5. 5.632 + 661 =
6. 6.705 + 281 =
7. 7.490 − 112 =
8. 8.560 − 416 =
9. 9.512 − 372 =
10. 10.749 + 361 =
11. 11.528 − 352 =
12. 12.547 − 183 =
13. 13.491 − 266 =
14. 14.413 − 134 =
15. 15.740 − 358 =
16. 16.642 + 394 =
17. 17.586 − 196 =
18. 18.495 + 379 =
19. 19.285 + 291 =
20. 20.665 + 535 =
21. 21.133 + 384 =
22. 22.616 + 218 =
23. 23.467 − 256 =
24. 24.468 + 564 =
25. 25.453 + 567 =
26. 26.811 − 372 =
27. 27.450 + 531 =
28. 28.721 − 291 =
29. 29.148 + 348 =
30. 30.667 + 631 =
31. 31.741 − 225 =
32. 32.839 − 584 =
33. 33.188 + 301 =
34. 34.416 − 243 =
35. 35.317 + 141 =
36. 36.669 + 138 =
37. 37.772 − 164 =
38. 38.877 − 505 =
39. 39.499 − 388 =
40. 40.216 + 605 =

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths