Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 1 · 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. 1.900 − 188 =
2. 2.154 + ? = 807
3. 3.A train has 574 people in the front coaches and 408 people in the back coaches. How many people are on the train?
4. 4.A train has 463 people in the front coaches and 484 people in the back coaches. How many people are on the train?
5. 5.A train has 197 people in the front coaches and 237 people in the back coaches. How many people are on the train?
6. 6.298 + 289 =
7. 7.385 + 393 =
8. 8.181 + ? = 456
9. 9.A school has 932 children. 457 of them are girls. How many boys are there?
10. 10.345 − ? = 157
11. 11.? + 582 = 735
12. 12.720 − 179 =
13. 13.324 − ? = 206
14. 14.A school has 751 children. 422 of them are girls. How many boys are there?
15. 15.545 − 342 =
16. 16.? + 390 = 753
17. 17.176 + 380 =
18. 18.A school has 392 children. 108 of them are girls. How many boys are there?
19. 19.? + 304 = 473
20. 20.423 − 392 =
21. 21.A school has 724 children. 466 of them are girls. How many boys are there?
22. 22.834 − ? = 620
23. 23.759 − 416 =
24. 24.578 + ? = 924
25. 25.531 + ? = 673
26. 26.A school has 387 children. 112 of them are girls. How many boys are there?
27. 27.802 + 111 =
28. 28.? − 132 = 432
29. 29.272 − 268 =
30. 30.664 − 173 =
31. 31.A school has 414 children. 391 of them are girls. How many boys are there?
32. 32.716 − ? = 216
33. 33.? + 433 = 845
34. 34.? − 589 = 119
35. 35.? − 196 = 97
36. 36.201 + 485 =
37. 37.352 + ? = 782
38. 38.500 − ? = 234
39. 39.A school has 400 children. 297 of them are girls. How many boys are there?
40. 40.858 + ? = 996

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