Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 358 · 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. 1.838 + 102 =
2. 2.786 + 129 =
3. 3.397 − 290 =
4. 4.541 + 163 =
5. 5.A school has 422 children. 266 of them are girls. How many boys are there?
6. 6.355 − ? = 190
7. 7.A train has 710 people in the front coaches and 115 people in the back coaches. How many people are on the train?
8. 8.A school has 918 children. 805 of them are girls. How many boys are there?
9. 9.A school has 239 children. 116 of them are girls. How many boys are there?
10. 10.267 + ? = 750
11. 11.? + 875 = 977
12. 12.909 − ? = 566
13. 13.? − 267 = 223
14. 14.A train has 601 people in the front coaches and 268 people in the back coaches. How many people are on the train?
15. 15.105 + 622 =
16. 16.270 + 370 =
17. 17.? + 211 = 564
18. 18.521 + 294 =
19. 19.A school has 363 children. 184 of them are girls. How many boys are there?
20. 20.A school has 674 children. 455 of them are girls. How many boys are there?
21. 21.A train has 330 people in the front coaches and 667 people in the back coaches. How many people are on the train?
22. 22.517 + 274 =
23. 23.633 − ? = 524
24. 24.802 + ? = 964
25. 25.A school has 815 children. 169 of them are girls. How many boys are there?
26. 26.113 + 688 =
27. 27.997 − 405 =
28. 28.180 + 571 =
29. 29.283 − ? = 154
30. 30.? + 771 = 908
31. 31.291 − 123 =
32. 32.? − 199 = 424
33. 33.394 − 333 =
34. 34.278 − ? = 5
35. 35.298 + 458 =
36. 36.442 + 222 =
37. 37.373 − ? = 270
38. 38.749 + 105 =
39. 39.A train has 310 people in the front coaches and 636 people in the back coaches. How many people are on the train?
40. 40.885 + ? = 988

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