3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 611 · 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. 1.644 + 183 =
2. 2.874 − 557 =
3. 3.313 + 409 =
4. 4.960 − 249 =
5. 5.842 − 389 =
6. 6.877 − 362 =
7. 7.409 + 198 =
8. 8.767 − 242 =
9. 9.236 + 215 =
10. 10.793 − 469 =
11. 11.296 + 197 =
12. 12.314 + 127 =
13. 13.687 − 386 =
14. 14.538 − 411 =
15. 15.367 + 534 =
16. 16.835 − 241 =
17. 17.281 + 341 =
18. 18.632 − 464 =
19. 19.269 + 154 =
20. 20.967 − 321 =
21. 21.740 − 433 =
22. 22.924 − 492 =
23. 23.964 − 345 =
24. 24.140 + 401 =
25. 25.331 + 358 =
26. 26.519 − 118 =
27. 27.383 + 391 =
28. 28.445 − 316 =
29. 29.471 + 521 =
30. 30.593 + 251 =
31. 31.451 − 156 =
32. 32.632 + 269 =
33. 33.486 + 507 =
34. 34.655 − 251 =
35. 35.522 − 194 =
36. 36.775 − 291 =
37. 37.549 + 158 =
38. 38.693 + 538 =
39. 39.489 + 159 =
40. 40.160 + 414 =

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