Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 101 · 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 753 children. 383 of them are girls. How many boys are there?
2. 2.A school has 721 children. 525 of them are girls. How many boys are there?
3. 3.945 − 933 =
4. 4.646 − 592 =
5. 5.367 + 525 =
6. 6.A train has 483 people in the front coaches and 219 people in the back coaches. How many people are on the train?
7. 7.727 − 713 =
8. 8.935 − 210 =
9. 9.A train has 619 people in the front coaches and 149 people in the back coaches. How many people are on the train?
10. 10.563 − ? = 142
11. 11.? + 783 = 963
12. 12.543 + 407 =
13. 13.840 − 127 =
14. 14.A school has 686 children. 537 of them are girls. How many boys are there?
15. 15.A school has 391 children. 328 of them are girls. How many boys are there?
16. 16.483 + 277 =
17. 17.230 + 687 =
18. 18.625 + ? = 914
19. 19.235 − 216 =
20. 20.A train has 589 people in the front coaches and 310 people in the back coaches. How many people are on the train?
21. 21.? − 238 = 433
22. 22.661 − 576 =
23. 23.? + 347 = 786
24. 24.893 − 559 =
25. 25.A school has 772 children. 174 of them are girls. How many boys are there?
26. 26.A school has 211 children. 191 of them are girls. How many boys are there?
27. 27.754 − 736 =
28. 28.487 − 147 =
29. 29.215 − 202 =
30. 30.681 − 340 =
31. 31.105 + 502 =
32. 32.823 − ? = 643
33. 33.276 − 183 =
34. 34.897 − ? = 363
35. 35.? − 394 = 336
36. 36.651 − 218 =
37. 37.211 + 566 =
38. 38.? + 275 = 988
39. 39.? − 204 = 23
40. 40.A school has 828 children. 806 of them are girls. How many boys are there?

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