Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 53 · 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.A school has 796 children. 758 of them are girls. How many boys are there?
2. 2.A train has 808 people in the front coaches and 184 people in the back coaches. How many people are on the train?
3. 3.850 − 792 =
4. 4.425 − ? = 232
5. 5.853 − 152 =
6. 6.357 + 499 =
7. 7.859 + ? = 971
8. 8.255 − 134 =
9. 9.907 − ? = 577
10. 10.519 + ? = 997
11. 11.721 + ? = 847
12. 12.A train has 581 people in the front coaches and 415 people in the back coaches. How many people are on the train?
13. 13.836 − 162 =
14. 14.687 − 130 =
15. 15.292 − 131 =
16. 16.? + 188 = 317
17. 17.? − 189 = 217
18. 18.586 + 294 =
19. 19.344 − 225 =
20. 20.? + 626 = 921
21. 21.A school has 488 children. 469 of them are girls. How many boys are there?
22. 22.323 + 433 =
23. 23.A school has 766 children. 466 of them are girls. How many boys are there?
24. 24.527 + 260 =
25. 25.715 − 636 =
26. 26.? − 107 = 868
27. 27.661 − 140 =
28. 28.? + 574 = 889
29. 29.489 − 403 =
30. 30.A school has 671 children. 110 of them are girls. How many boys are there?
31. 31.852 + 134 =
32. 32.? + 135 = 885
33. 33.? + 554 = 848
34. 34.A school has 727 children. 186 of them are girls. How many boys are there?
35. 35.485 + 360 =
36. 36.? − 396 = 337
37. 37.674 + 272 =
38. 38.503 + 131 =
39. 39.? − 240 = 341
40. 40.A school has 387 children. 102 of them are girls. How many boys are there?

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