Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 163 · 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 420 children. 297 of them are girls. How many boys are there?
2. 2.959 − 874 =
3. 3.972 − 125 =
4. 4.418 + 135 =
5. 5.351 − 219 =
6. 6.? + 517 = 950
7. 7.? + 598 = 750
8. 8.869 + 118 =
9. 9.461 + 274 =
10. 10.? + 585 = 987
11. 11.A school has 406 children. 271 of them are girls. How many boys are there?
12. 12.456 + 298 =
13. 13.833 + ? = 938
14. 14.747 − ? = 157
15. 15.A train has 321 people in the front coaches and 239 people in the back coaches. How many people are on the train?
16. 16.327 − 252 =
17. 17.292 − ? = 158
18. 18.837 + ? = 951
19. 19.A school has 400 children. 373 of them are girls. How many boys are there?
20. 20.334 + ? = 681
21. 21.A school has 240 children. 216 of them are girls. How many boys are there?
22. 22.244 + 457 =
23. 23.? − 121 = 97
24. 24.834 + 133 =
25. 25.521 + 464 =
26. 26.? + 308 = 650
27. 27.363 − ? = 97
28. 28.A train has 129 people in the front coaches and 617 people in the back coaches. How many people are on the train?
29. 29.A school has 757 children. 299 of them are girls. How many boys are there?
30. 30.299 − ? = 112
31. 31.A school has 876 children. 350 of them are girls. How many boys are there?
32. 32.A school has 582 children. 214 of them are girls. How many boys are there?
33. 33.? + 886 = 990
34. 34.619 + 234 =
35. 35.A school has 817 children. 239 of them are girls. How many boys are there?
36. 36.151 + 801 =
37. 37.304 − 127 =
38. 38.511 + ? = 844
39. 39.866 − 474 =
40. 40.258 − 181 =

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