Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 145 · 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. 1.292 − 143 =
2. 2.542 + 219 =
3. 3.? + 888 = 994
4. 4.212 + 564 =
5. 5.858 + 100 =
6. 6.A train has 356 people in the front coaches and 366 people in the back coaches. How many people are on the train?
7. 7.A school has 342 children. 299 of them are girls. How many boys are there?
8. 8.107 + 111 =
9. 9.395 − 126 =
10. 10.412 − 347 =
11. 11.? − 267 = 274
12. 12.A train has 411 people in the front coaches and 140 people in the back coaches. How many people are on the train?
13. 13.365 + 187 =
14. 14.673 + 112 =
15. 15.719 − ? = 413
16. 16.622 − 383 =
17. 17.A train has 148 people in the front coaches and 139 people in the back coaches. How many people are on the train?
18. 18.516 − 109 =
19. 19.650 + 295 =
20. 20.295 + 317 =
21. 21.396 − 334 =
22. 22.903 − 575 =
23. 23.507 − 176 =
24. 24.A school has 355 children. 267 of them are girls. How many boys are there?
25. 25.A train has 493 people in the front coaches and 420 people in the back coaches. How many people are on the train?
26. 26.139 + 477 =
27. 27.790 + 129 =
28. 28.136 + ? = 607
29. 29.425 − 419 =
30. 30.231 − ? = 53
31. 31.A train has 895 people in the front coaches and 104 people in the back coaches. How many people are on the train?
32. 32.299 − 189 =
33. 33.A train has 826 people in the front coaches and 107 people in the back coaches. How many people are on the train?
34. 34.640 − ? = 30
35. 35.? − 192 = 266
36. 36.525 + 281 =
37. 37.? − 253 = 79
38. 38.742 − 330 =
39. 39.A school has 656 children. 237 of them are girls. How many boys are there?
40. 40.? − 329 = 10

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