Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 502 · 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. 1.200 + 155 =
2. 2.A train has 839 people in the front coaches and 100 people in the back coaches. How many people are on the train?
3. 3.981 − 601 =
4. 4.587 + 257 =
5. 5.185 + 498 =
6. 6.270 − 153 =
7. 7.294 − 122 =
8. 8.A school has 712 children. 469 of them are girls. How many boys are there?
9. 9.771 − ? = 441
10. 10.A school has 277 children. 144 of them are girls. How many boys are there?
11. 11.246 − 145 =
12. 12.A school has 904 children. 470 of them are girls. How many boys are there?
13. 13.572 − 176 =
14. 14.261 − ? = 93
15. 15.638 + 147 =
16. 16.? + 403 = 513
17. 17.339 + 388 =
18. 18.? + 271 = 951
19. 19.843 + 119 =
20. 20.406 + 223 =
21. 21.115 + 538 =
22. 22.A school has 763 children. 615 of them are girls. How many boys are there?
23. 23.414 + 336 =
24. 24.608 − 539 =
25. 25.826 − 662 =
26. 26.? + 607 = 993
27. 27.339 + 286 =
28. 28.278 − 264 =
29. 29.335 − ? = 141
30. 30.A train has 687 people in the front coaches and 110 people in the back coaches. How many people are on the train?
31. 31.684 − 178 =
32. 32.184 + ? = 659
33. 33.? − 309 = 439
34. 34.? − 157 = 191
35. 35.? − 109 = 143
36. 36.376 − ? = 79
37. 37.459 + ? = 876
38. 38.500 − 306 =
39. 39.A school has 337 children. 231 of them are girls. How many boys are there?
40. 40.A train has 898 people in the front coaches and 101 people in the back coaches. How many people are on the train?

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