Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 936 · 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 681 children. 490 of them are girls. How many boys are there?
2. 2.221 + ? = 430
3. 3.A school has 271 children. 217 of them are girls. How many boys are there?
4. 4.A train has 834 people in the front coaches and 121 people in the back coaches. How many people are on the train?
5. 5.454 − 220 =
6. 6.A train has 539 people in the front coaches and 180 people in the back coaches. How many people are on the train?
7. 7.? − 255 = 18
8. 8.397 + 512 =
9. 9.A school has 921 children. 529 of them are girls. How many boys are there?
10. 10.723 + ? = 985
11. 11.337 + 447 =
12. 12.? + 217 = 706
13. 13.? − 535 = 451
14. 14.? − 522 = 182
15. 15.577 + 361 =
16. 16.A school has 784 children. 310 of them are girls. How many boys are there?
17. 17.412 − 198 =
18. 18.750 − ? = 11
19. 19.429 + 478 =
20. 20.657 + 275 =
21. 21.366 + 353 =
22. 22.468 − 370 =
23. 23.912 − 657 =
24. 24.451 − 228 =
25. 25.866 − 418 =
26. 26.? + 302 = 497
27. 27.? + 733 = 893
28. 28.811 − ? = 340
29. 29.684 − 605 =
30. 30.798 − 237 =
31. 31.A school has 444 children. 237 of them are girls. How many boys are there?
32. 32.510 − 151 =
33. 33.370 + ? = 565
34. 34.374 + ? = 808
35. 35.606 − 116 =
36. 36.746 − 690 =
37. 37.A train has 207 people in the front coaches and 194 people in the back coaches. How many people are on the train?
38. 38.A school has 302 children. 266 of them are girls. How many boys are there?
39. 39.207 + ? = 916
40. 40.A train has 768 people in the front coaches and 134 people in the back coaches. How many people are on the train?

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