Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 591 · 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 513 children. 205 of them are girls. How many boys are there?
2. 2.A school has 633 children. 196 of them are girls. How many boys are there?
3. 3.A train has 101 people in the front coaches and 271 people in the back coaches. How many people are on the train?
4. 4.991 − ? = 614
5. 5.286 + 569 =
6. 6.A school has 574 children. 312 of them are girls. How many boys are there?
7. 7.298 + ? = 973
8. 8.652 − ? = 100
9. 9.A train has 491 people in the front coaches and 353 people in the back coaches. How many people are on the train?
10. 10.190 + 255 =
11. 11.808 − 693 =
12. 12.A school has 264 children. 112 of them are girls. How many boys are there?
13. 13.663 − 400 =
14. 14.A train has 760 people in the front coaches and 177 people in the back coaches. How many people are on the train?
15. 15.A school has 361 children. 179 of them are girls. How many boys are there?
16. 16.A school has 796 children. 267 of them are girls. How many boys are there?
17. 17.488 − 172 =
18. 18.A train has 753 people in the front coaches and 222 people in the back coaches. How many people are on the train?
19. 19.675 − 411 =
20. 20.272 − ? = 36
21. 21.319 − 162 =
22. 22.? − 698 = 157
23. 23.829 + 133 =
24. 24.218 + 384 =
25. 25.A school has 428 children. 285 of them are girls. How many boys are there?
26. 26.159 + ? = 387
27. 27.? − 283 = 270
28. 28.A train has 812 people in the front coaches and 160 people in the back coaches. How many people are on the train?
29. 29.173 + 630 =
30. 30.A school has 718 children. 504 of them are girls. How many boys are there?
31. 31.A train has 292 people in the front coaches and 657 people in the back coaches. How many people are on the train?
32. 32.681 − 470 =
33. 33.288 + 332 =
34. 34.? + 624 = 832
35. 35.569 − 191 =
36. 36.A train has 103 people in the front coaches and 468 people in the back coaches. How many people are on the train?
37. 37.? − 203 = 110
38. 38.A school has 601 children. 277 of them are girls. How many boys are there?
39. 39.? + 517 = 982
40. 40.A train has 610 people in the front coaches and 369 people in the back coaches. How many people are on the train?

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