Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 490 · 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.A train has 758 people in the front coaches and 123 people in the back coaches. How many people are on the train?
2. 2.610 + 163 =
3. 3.537 − ? = 287
4. 4.424 − ? = 172
5. 5.? − 152 = 320
6. 6.283 − 115 =
7. 7.A train has 100 people in the front coaches and 577 people in the back coaches. How many people are on the train?
8. 8.? + 589 = 773
9. 9.658 − 286 =
10. 10.665 + 150 =
11. 11.657 − 548 =
12. 12.884 − 764 =
13. 13.A train has 659 people in the front coaches and 159 people in the back coaches. How many people are on the train?
14. 14.A train has 354 people in the front coaches and 413 people in the back coaches. How many people are on the train?
15. 15.A train has 291 people in the front coaches and 232 people in the back coaches. How many people are on the train?
16. 16.956 − 765 =
17. 17.789 + 182 =
18. 18.A train has 542 people in the front coaches and 433 people in the back coaches. How many people are on the train?
19. 19.329 + ? = 949
20. 20.A school has 861 children. 154 of them are girls. How many boys are there?
21. 21.A school has 291 children. 266 of them are girls. How many boys are there?
22. 22.163 + ? = 301
23. 23.A train has 849 people in the front coaches and 113 people in the back coaches. How many people are on the train?
24. 24.A school has 624 children. 564 of them are girls. How many boys are there?
25. 25.712 − 150 =
26. 26.802 + 130 =
27. 27.192 + 643 =
28. 28.950 − 710 =
29. 29.259 + 659 =
30. 30.A train has 845 people in the front coaches and 153 people in the back coaches. How many people are on the train?
31. 31.A school has 427 children. 278 of them are girls. How many boys are there?
32. 32.A train has 623 people in the front coaches and 100 people in the back coaches. How many people are on the train?
33. 33.186 + ? = 583
34. 34.754 − ? = 503
35. 35.406 − 388 =
36. 36.A train has 668 people in the front coaches and 178 people in the back coaches. How many people are on the train?
37. 37.523 + 274 =
38. 38.114 + 839 =
39. 39.517 + 472 =
40. 40.A school has 838 children. 181 of them are girls. How many boys are there?

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