Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 170 · 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.? − 149 = 700
2. 2.342 − 329 =
3. 3.749 − ? = 102
4. 4.966 − 366 =
5. 5.A school has 850 children. 714 of them are girls. How many boys are there?
6. 6.A train has 863 people in the front coaches and 129 people in the back coaches. How many people are on the train?
7. 7.? − 152 = 278
8. 8.? − 109 = 440
9. 9.347 − 144 =
10. 10.A train has 743 people in the front coaches and 205 people in the back coaches. How many people are on the train?
11. 11.263 + ? = 648
12. 12.? − 426 = 78
13. 13.A school has 734 children. 731 of them are girls. How many boys are there?
14. 14.445 + ? = 645
15. 15.A school has 634 children. 309 of them are girls. How many boys are there?
16. 16.A school has 618 children. 244 of them are girls. How many boys are there?
17. 17.347 − 223 =
18. 18.? + 825 = 963
19. 19.580 + ? = 794
20. 20.? − 404 = 426
21. 21.621 + 132 =
22. 22.608 + 171 =
23. 23.632 + ? = 913
24. 24.? + 897 = 998
25. 25.? + 143 = 303
26. 26.A school has 229 children. 206 of them are girls. How many boys are there?
27. 27.A school has 475 children. 223 of them are girls. How many boys are there?
28. 28.467 + 329 =
29. 29.649 − 580 =
30. 30.940 − 578 =
31. 31.411 + 468 =
32. 32.A train has 104 people in the front coaches and 825 people in the back coaches. How many people are on the train?
33. 33.673 − 485 =
34. 34.298 − ? = 192
35. 35.852 + ? = 991
36. 36.585 − 403 =
37. 37.547 + 127 =
38. 38.456 + ? = 711
39. 39.? − 418 = 103
40. 40.? + 377 = 994

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