Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 338 · 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.? − 147 = 186
2. 2.A school has 999 children. 491 of them are girls. How many boys are there?
3. 3.525 + ? = 812
4. 4.421 − 342 =
5. 5.? + 150 = 604
6. 6.465 + 198 =
7. 7.386 + 270 =
8. 8.770 − ? = 235
9. 9.278 − ? = 108
10. 10.A school has 454 children. 188 of them are girls. How many boys are there?
11. 11.624 − ? = 65
12. 12.145 + ? = 336
13. 13.329 − 310 =
14. 14.176 + 435 =
15. 15.540 − 283 =
16. 16.875 + 101 =
17. 17.902 − 845 =
18. 18.A school has 287 children. 228 of them are girls. How many boys are there?
19. 19.917 − 207 =
20. 20.715 + 277 =
21. 21.? − 192 = 147
22. 22.A train has 269 people in the front coaches and 561 people in the back coaches. How many people are on the train?
23. 23.884 + ? = 994
24. 24.501 + 262 =
25. 25.203 + 266 =
26. 26.232 − 125 =
27. 27.294 − 260 =
28. 28.576 − 112 =
29. 29.146 + 480 =
30. 30.A train has 414 people in the front coaches and 419 people in the back coaches. How many people are on the train?
31. 31.224 + 448 =
32. 32.798 + 174 =
33. 33.851 − 839 =
34. 34.946 − 206 =
35. 35.894 + 100 =
36. 36.127 + 112 =
37. 37.650 − 179 =
38. 38.? + 196 = 917
39. 39.848 + ? = 977
40. 40.A school has 875 children. 724 of them are girls. How many boys are there?

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