Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 384 · 40 sums

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

1. 1.159 + ? = 814
2. 2.A school has 627 children. 512 of them are girls. How many boys are there?
3. 3.547 − 385 =
4. 4.266 + 523 =
5. 5.A school has 934 children. 519 of them are girls. How many boys are there?
6. 6.343 + ? = 856
7. 7.913 − 845 =
8. 8.? − 231 = 22
9. 9.A school has 763 children. 137 of them are girls. How many boys are there?
10. 10.A school has 378 children. 337 of them are girls. How many boys are there?
11. 11.480 − 197 =
12. 12.472 − ? = 356
13. 13.165 + 145 =
14. 14.613 + ? = 777
15. 15.115 + 759 =
16. 16.? − 234 = 139
17. 17.? + 416 = 731
18. 18.378 − ? = 99
19. 19.918 − ? = 502
20. 20.A train has 656 people in the front coaches and 300 people in the back coaches. How many people are on the train?
21. 21.? + 826 = 965
22. 22.A train has 871 people in the front coaches and 116 people in the back coaches. How many people are on the train?
23. 23.? + 356 = 523
24. 24.A school has 253 children. 111 of them are girls. How many boys are there?
25. 25.542 + ? = 689
26. 26.836 + 132 =
27. 27.723 + 272 =
28. 28.899 + ? = 999
29. 29.512 + 302 =
30. 30.378 − ? = 152
31. 31.? − 379 = 8
32. 32.682 + 199 =
33. 33.659 + 145 =
34. 34.767 + 208 =
35. 35.862 − 348 =
36. 36.384 − ? = 29
37. 37.? − 722 = 244
38. 38.A school has 541 children. 410 of them are girls. How many boys are there?
39. 39.A school has 508 children. 503 of them are girls. How many boys are there?
40. 40.A school has 992 children. 741 of them are girls. How many boys are there?

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