Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 977 · 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. 1.983 − 232 =
2. 2.695 − 371 =
3. 3.874 − ? = 299
4. 4.A school has 271 children. 143 of them are girls. How many boys are there?
5. 5.979 − 492 =
6. 6.A school has 688 children. 151 of them are girls. How many boys are there?
7. 7.583 − ? = 105
8. 8.830 − 718 =
9. 9.A train has 784 people in the front coaches and 202 people in the back coaches. How many people are on the train?
10. 10.257 − 141 =
11. 11.? + 261 = 787
12. 12.483 + 361 =
13. 13.685 − 203 =
14. 14.693 − 576 =
15. 15.987 − ? = 585
16. 16.779 + ? = 953
17. 17.896 − 195 =
18. 18.784 − ? = 272
19. 19.444 + ? = 767
20. 20.970 − ? = 488
21. 21.292 − 280 =
22. 22.A school has 956 children. 952 of them are girls. How many boys are there?
23. 23.466 + 309 =
24. 24.? − 221 = 543
25. 25.A school has 828 children. 137 of them are girls. How many boys are there?
26. 26.A train has 207 people in the front coaches and 278 people in the back coaches. How many people are on the train?
27. 27.294 − 144 =
28. 28.638 + 249 =
29. 29.526 + ? = 895
30. 30.188 + 267 =
31. 31.884 − 567 =
32. 32.A school has 261 children. 158 of them are girls. How many boys are there?
33. 33.684 + 303 =
34. 34.701 + ? = 820
35. 35.790 − 174 =
36. 36.872 − 145 =
37. 37.A school has 242 children. 219 of them are girls. How many boys are there?
38. 38.461 − 286 =
39. 39.? + 135 = 870
40. 40.A school has 853 children. 131 of them are girls. How many boys are there?

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