Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 853 · 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. 1.166 + 386 =
2. 2.455 + 486 =
3. 3.804 + 109 =
4. 4.604 − ? = 365
5. 5.714 + ? = 841
6. 6.243 − ? = 101
7. 7.859 − 810 =
8. 8.? + 311 = 635
9. 9.317 − 160 =
10. 10.318 + 184 =
11. 11.A train has 113 people in the front coaches and 648 people in the back coaches. How many people are on the train?
12. 12.437 − ? = 211
13. 13.A school has 572 children. 103 of them are girls. How many boys are there?
14. 14.741 − ? = 596
15. 15.655 + 189 =
16. 16.295 − 120 =
17. 17.359 − ? = 193
18. 18.206 + 127 =
19. 19.940 − 728 =
20. 20.946 − 406 =
21. 21.? − 403 = 83
22. 22.A school has 307 children. 224 of them are girls. How many boys are there?
23. 23.690 + 223 =
24. 24.A school has 929 children. 393 of them are girls. How many boys are there?
25. 25.A school has 770 children. 316 of them are girls. How many boys are there?
26. 26.251 + 440 =
27. 27.899 + 100 =
28. 28.568 − 287 =
29. 29.? + 804 = 945
30. 30.904 − 758 =
31. 31.? − 189 = 356
32. 32.A train has 314 people in the front coaches and 463 people in the back coaches. How many people are on the train?
33. 33.491 + 146 =
34. 34.? + 110 = 466
35. 35.210 + 300 =
36. 36.A school has 282 children. 258 of them are girls. How many boys are there?
37. 37.784 − 322 =
38. 38.? + 650 = 884
39. 39.A school has 823 children. 476 of them are girls. How many boys are there?
40. 40.927 − ? = 250

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