Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 260 · 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. 1.486 + ? = 833
2. 2.503 + 166 =
3. 3.324 − 102 =
4. 4.? + 571 = 679
5. 5.? − 539 = 210
6. 6.A school has 598 children. 508 of them are girls. How many boys are there?
7. 7.? + 748 = 870
8. 8.A school has 597 children. 513 of them are girls. How many boys are there?
9. 9.474 − 329 =
10. 10.618 − ? = 391
11. 11.457 + 435 =
12. 12.A school has 988 children. 309 of them are girls. How many boys are there?
13. 13.545 + ? = 982
14. 14.389 − 348 =
15. 15.732 − 709 =
16. 16.481 − ? = 177
17. 17.? + 221 = 536
18. 18.A train has 195 people in the front coaches and 426 people in the back coaches. How many people are on the train?
19. 19.892 − ? = 644
20. 20.? − 409 = 195
21. 21.729 − 686 =
22. 22.? − 890 = 4
23. 23.662 − ? = 277
24. 24.282 + 612 =
25. 25.A train has 227 people in the front coaches and 550 people in the back coaches. How many people are on the train?
26. 26.783 − 576 =
27. 27.848 − 452 =
28. 28.358 − 212 =
29. 29.A train has 332 people in the front coaches and 169 people in the back coaches. How many people are on the train?
30. 30.? + 374 = 834
31. 31.700 − 529 =
32. 32.A school has 595 children. 187 of them are girls. How many boys are there?
33. 33.576 − ? = 356
34. 34.261 + 656 =
35. 35.397 + ? = 599
36. 36.377 − 337 =
37. 37.A school has 648 children. 634 of them are girls. How many boys are there?
38. 38.299 + ? = 640
39. 39.505 − 221 =
40. 40.285 + 332 =

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