Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 741 · 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. 1.851 − 330 =
2. 2.584 + ? = 776
3. 3.850 + ? = 992
4. 4.? + 160 = 364
5. 5.660 − 445 =
6. 6.821 − 356 =
7. 7.? − 651 = 57
8. 8.514 − 164 =
9. 9.766 + 156 =
10. 10.277 + ? = 634
11. 11.A train has 521 people in the front coaches and 333 people in the back coaches. How many people are on the train?
12. 12.431 + 353 =
13. 13.824 − 237 =
14. 14.A school has 796 children. 709 of them are girls. How many boys are there?
15. 15.A train has 438 people in the front coaches and 331 people in the back coaches. How many people are on the train?
16. 16.321 − 234 =
17. 17.A school has 621 children. 257 of them are girls. How many boys are there?
18. 18.680 + ? = 982
19. 19.460 + 256 =
20. 20.819 − 419 =
21. 21.737 − 279 =
22. 22.269 + 562 =
23. 23.A train has 188 people in the front coaches and 747 people in the back coaches. How many people are on the train?
24. 24.591 + 326 =
25. 25.121 + ? = 967
26. 26.833 + ? = 950
27. 27.246 − ? = 44
28. 28.A school has 792 children. 140 of them are girls. How many boys are there?
29. 29.620 − ? = 512
30. 30.863 − ? = 32
31. 31.290 − ? = 170
32. 32.421 − 385 =
33. 33.521 − ? = 237
34. 34.A train has 469 people in the front coaches and 111 people in the back coaches. How many people are on the train?
35. 35.511 − 497 =
36. 36.778 − 286 =
37. 37.? + 568 = 990
38. 38.A school has 737 children. 250 of them are girls. How many boys are there?
39. 39.965 − ? = 861
40. 40.? − 207 = 12

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