Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 267 · 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 train has 668 people in the front coaches and 324 people in the back coaches. How many people are on the train?
2. 2.715 + 128 =
3. 3.? − 616 = 287
4. 4.706 − 631 =
5. 5.A school has 400 children. 356 of them are girls. How many boys are there?
6. 6.674 − 409 =
7. 7.671 + 264 =
8. 8.821 − 521 =
9. 9.? + 577 = 765
10. 10.? + 453 = 790
11. 11.116 + 199 =
12. 12.? − 203 = 190
13. 13.133 + ? = 819
14. 14.823 − 368 =
15. 15.? + 775 = 911
16. 16.A train has 771 people in the front coaches and 113 people in the back coaches. How many people are on the train?
17. 17.593 + 264 =
18. 18.566 + ? = 752
19. 19.935 − 204 =
20. 20.A train has 711 people in the front coaches and 158 people in the back coaches. How many people are on the train?
21. 21.861 − ? = 535
22. 22.655 − 485 =
23. 23.164 + 509 =
24. 24.548 − ? = 350
25. 25.? − 164 = 91
26. 26.426 + 352 =
27. 27.? + 107 = 853
28. 28.A school has 252 children. 251 of them are girls. How many boys are there?
29. 29.369 + ? = 570
30. 30.? − 627 = 345
31. 31.278 − 115 =
32. 32.? − 114 = 551
33. 33.A school has 943 children. 166 of them are girls. How many boys are there?
34. 34.511 + 321 =
35. 35.940 − 552 =
36. 36.? + 821 = 947
37. 37.794 − ? = 15
38. 38.A school has 346 children. 149 of them are girls. How many boys are there?
39. 39.294 − 254 =
40. 40.A train has 513 people in the front coaches and 431 people in the back coaches. How many people are on the train?

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