3-Digit Mental Addition and Subtraction Worksheet

Mental maths lesson 20: Add and subtract 3-digit numbers left to right · Set 602 · 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. 1.893 − 564 =
2. 2.468 − 142 =
3. 3.533 − 206 =
4. 4.925 − 488 =
5. 5.529 + 544 =
6. 6.722 − 221 =
7. 7.488 − 188 =
8. 8.314 + 251 =
9. 9.833 − 171 =
10. 10.686 − 463 =
11. 11.633 − 529 =
12. 12.127 + 676 =
13. 13.973 − 497 =
14. 14.749 + 121 =
15. 15.278 + 251 =
16. 16.971 − 178 =
17. 17.553 − 359 =
18. 18.444 − 318 =
19. 19.426 − 112 =
20. 20.388 + 378 =
21. 21.530 + 511 =
22. 22.149 + 284 =
23. 23.696 + 236 =
24. 24.439 − 205 =
25. 25.630 − 186 =
26. 26.652 − 151 =
27. 27.755 − 139 =
28. 28.495 − 244 =
29. 29.954 − 137 =
30. 30.891 − 759 =
31. 31.456 − 267 =
32. 32.607 + 257 =
33. 33.685 − 441 =
34. 34.777 + 529 =
35. 35.161 + 363 =
36. 36.695 − 262 =
37. 37.683 − 437 =
38. 38.345 + 248 =
39. 39.728 + 195 =
40. 40.961 − 517 =

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