Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 397 · 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. 1.579 + ? = 689
2. 2.305 − 103 =
3. 3.114 + 863 =
4. 4.870 + 102 =
5. 5.624 − 599 =
6. 6.A train has 460 people in the front coaches and 488 people in the back coaches. How many people are on the train?
7. 7.247 + 250 =
8. 8.428 − 102 =
9. 9.882 + ? = 999
10. 10.425 + 344 =
11. 11.A train has 580 people in the front coaches and 335 people in the back coaches. How many people are on the train?
12. 12.A train has 851 people in the front coaches and 120 people in the back coaches. How many people are on the train?
13. 13.A school has 709 children. 136 of them are girls. How many boys are there?
14. 14.737 + 116 =
15. 15.A school has 522 children. 376 of them are girls. How many boys are there?
16. 16.A school has 672 children. 601 of them are girls. How many boys are there?
17. 17.396 − 395 =
18. 18.A train has 559 people in the front coaches and 342 people in the back coaches. How many people are on the train?
19. 19.284 − 186 =
20. 20.785 − ? = 57
21. 21.129 + 805 =
22. 22.A school has 506 children. 259 of them are girls. How many boys are there?
23. 23.424 + ? = 536
24. 24.326 + 222 =
25. 25.740 + ? = 983
26. 26.? + 164 = 598
27. 27.490 − ? = 69
28. 28.? − 204 = 81
29. 29.341 − 146 =
30. 30.452 + 208 =
31. 31.? − 125 = 176
32. 32.310 − 301 =
33. 33.689 − 279 =
34. 34.? − 448 = 382
35. 35.613 − ? = 503
36. 36.288 + 111 =
37. 37.? + 746 = 980
38. 38.147 + 523 =
39. 39.715 + 263 =
40. 40.414 + ? = 592

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