Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 419 · 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. 1.607 − 264 =
2. 2.? − 320 = 567
3. 3.? − 138 = 559
4. 4.492 − 126 =
5. 5.677 + 301 =
6. 6.A train has 884 people in the front coaches and 109 people in the back coaches. How many people are on the train?
7. 7.492 − ? = 295
8. 8.755 + ? = 894
9. 9.583 + 294 =
10. 10.839 + 140 =
11. 11.216 + 308 =
12. 12.A school has 222 children. 189 of them are girls. How many boys are there?
13. 13.355 − 100 =
14. 14.? + 284 = 920
15. 15.403 + 348 =
16. 16.356 + ? = 668
17. 17.? − 410 = 31
18. 18.310 + 471 =
19. 19.A train has 109 people in the front coaches and 825 people in the back coaches. How many people are on the train?
20. 20.203 − 171 =
21. 21.494 + ? = 721
22. 22.621 − ? = 308
23. 23.855 + 144 =
24. 24.713 − 413 =
25. 25.A school has 381 children. 118 of them are girls. How many boys are there?
26. 26.834 + 119 =
27. 27.213 − ? = 68
28. 28.546 − 536 =
29. 29.? − 160 = 69
30. 30.335 − ? = 121
31. 31.A train has 109 people in the front coaches and 228 people in the back coaches. How many people are on the train?
32. 32.567 − ? = 269
33. 33.925 − ? = 271
34. 34.A train has 153 people in the front coaches and 748 people in the back coaches. How many people are on the train?
35. 35.? + 336 = 794
36. 36.? − 175 = 87
37. 37.A school has 837 children. 187 of them are girls. How many boys are there?
38. 38.854 − 512 =
39. 39.165 + 389 =
40. 40.640 − ? = 509

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