Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 424 · 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 426 children. 339 of them are girls. How many boys are there?
2. 2.A train has 466 people in the front coaches and 525 people in the back coaches. How many people are on the train?
3. 3.137 + ? = 890
4. 4.742 + 170 =
5. 5.A school has 478 children. 298 of them are girls. How many boys are there?
6. 6.936 − ? = 597
7. 7.558 + 404 =
8. 8.? − 193 = 196
9. 9.747 + 161 =
10. 10.A school has 915 children. 499 of them are girls. How many boys are there?
11. 11.749 − 116 =
12. 12.A train has 149 people in the front coaches and 221 people in the back coaches. How many people are on the train?
13. 13.645 − 333 =
14. 14.369 − 208 =
15. 15.511 + 211 =
16. 16.848 − ? = 630
17. 17.A school has 714 children. 371 of them are girls. How many boys are there?
18. 18.411 − 175 =
19. 19.259 + 157 =
20. 20.A school has 651 children. 182 of them are girls. How many boys are there?
21. 21.207 + 390 =
22. 22.464 + 303 =
23. 23.A school has 282 children. 144 of them are girls. How many boys are there?
24. 24.311 − 224 =
25. 25.624 + ? = 846
26. 26.373 + ? = 879
27. 27.A train has 218 people in the front coaches and 292 people in the back coaches. How many people are on the train?
28. 28.490 + 189 =
29. 29.862 − ? = 529
30. 30.? − 560 = 24
31. 31.585 − ? = 85
32. 32.906 − ? = 405
33. 33.564 − 213 =
34. 34.205 + 791 =
35. 35.807 − ? = 239
36. 36.A school has 712 children. 192 of them are girls. How many boys are there?
37. 37.330 + 626 =
38. 38.? + 745 = 990
39. 39.779 + 135 =
40. 40.? + 496 = 665

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