Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 645 · 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.? − 217 = 328
2. 2.A school has 670 children. 441 of them are girls. How many boys are there?
3. 3.100 + 134 =
4. 4.901 − 893 =
5. 5.368 − 196 =
6. 6.289 − 135 =
7. 7.A school has 444 children. 253 of them are girls. How many boys are there?
8. 8.215 + ? = 426
9. 9.126 + 458 =
10. 10.277 + 403 =
11. 11.223 − 145 =
12. 12.675 + 314 =
13. 13.159 + ? = 529
14. 14.111 + ? = 257
15. 15.736 − 567 =
16. 16.840 − ? = 72
17. 17.A train has 229 people in the front coaches and 116 people in the back coaches. How many people are on the train?
18. 18.A train has 294 people in the front coaches and 682 people in the back coaches. How many people are on the train?
19. 19.A school has 902 children. 718 of them are girls. How many boys are there?
20. 20.213 + 385 =
21. 21.? + 576 = 880
22. 22.326 − 161 =
23. 23.291 − 274 =
24. 24.? − 328 = 498
25. 25.739 − 115 =
26. 26.387 − 284 =
27. 27.767 − 276 =
28. 28.282 − ? = 178
29. 29.601 + 389 =
30. 30.974 − ? = 220
31. 31.? + 322 = 422
32. 32.448 + 219 =
33. 33.545 − 120 =
34. 34.364 − ? = 162
35. 35.? − 258 = 340
36. 36.778 + 102 =
37. 37.A school has 978 children. 726 of them are girls. How many boys are there?
38. 38.833 − 283 =
39. 39.423 + 133 =
40. 40.953 − 704 =

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