Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 726 · 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. 1.189 + 542 =
2. 2.A school has 306 children. 194 of them are girls. How many boys are there?
3. 3.686 + 229 =
4. 4.A school has 566 children. 457 of them are girls. How many boys are there?
5. 5.585 + 105 =
6. 6.231 − 173 =
7. 7.A school has 297 children. 163 of them are girls. How many boys are there?
8. 8.208 + 124 =
9. 9.? − 170 = 244
10. 10.? − 123 = 92
11. 11.403 + ? = 618
12. 12.? − 299 = 142
13. 13.A school has 675 children. 504 of them are girls. How many boys are there?
14. 14.911 − 513 =
15. 15.A train has 698 people in the front coaches and 199 people in the back coaches. How many people are on the train?
16. 16.? − 409 = 502
17. 17.A school has 436 children. 375 of them are girls. How many boys are there?
18. 18.104 + ? = 787
19. 19.494 − ? = 47
20. 20.211 + ? = 778
21. 21.726 − 558 =
22. 22.A school has 983 children. 373 of them are girls. How many boys are there?
23. 23.A school has 318 children. 199 of them are girls. How many boys are there?
24. 24.307 + ? = 665
25. 25.283 − 118 =
26. 26.? + 218 = 457
27. 27.318 − 111 =
28. 28.337 − 283 =
29. 29.988 − 781 =
30. 30.? + 369 = 513
31. 31.A train has 568 people in the front coaches and 374 people in the back coaches. How many people are on the train?
32. 32.291 − 270 =
33. 33.A school has 964 children. 898 of them are girls. How many boys are there?
34. 34.? − 286 = 515
35. 35.946 − 358 =
36. 36.591 − 293 =
37. 37.802 + 187 =
38. 38.522 − 497 =
39. 39.869 + 118 =
40. 40.253 + ? = 449

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