Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 779 · 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 school has 611 children. 186 of them are girls. How many boys are there?
2. 2.409 + 524 =
3. 3.208 − 103 =
4. 4.A school has 569 children. 219 of them are girls. How many boys are there?
5. 5.A school has 413 children. 371 of them are girls. How many boys are there?
6. 6.806 − 672 =
7. 7.585 − 386 =
8. 8.300 + 588 =
9. 9.769 − 199 =
10. 10.A train has 302 people in the front coaches and 380 people in the back coaches. How many people are on the train?
11. 11.718 + 155 =
12. 12.395 − 173 =
13. 13.A school has 810 children. 644 of them are girls. How many boys are there?
14. 14.A train has 365 people in the front coaches and 402 people in the back coaches. How many people are on the train?
15. 15.A train has 717 people in the front coaches and 110 people in the back coaches. How many people are on the train?
16. 16.872 − 286 =
17. 17.A train has 323 people in the front coaches and 631 people in the back coaches. How many people are on the train?
18. 18.402 + ? = 582
19. 19.496 + 291 =
20. 20.A train has 667 people in the front coaches and 156 people in the back coaches. How many people are on the train?
21. 21.321 + 197 =
22. 22.732 − ? = 422
23. 23.A school has 877 children. 602 of them are girls. How many boys are there?
24. 24.702 + ? = 925
25. 25.202 − 139 =
26. 26.A school has 330 children. 255 of them are girls. How many boys are there?
27. 27.123 + 115 =
28. 28.A train has 867 people in the front coaches and 117 people in the back coaches. How many people are on the train?
29. 29.610 − ? = 500
30. 30.A train has 154 people in the front coaches and 520 people in the back coaches. How many people are on the train?
31. 31.167 + 586 =
32. 32.? − 129 = 186
33. 33.A school has 272 children. 180 of them are girls. How many boys are there?
34. 34.913 − ? = 329
35. 35.703 + 173 =
36. 36.454 − 313 =
37. 37.? + 789 = 910
38. 38.A school has 479 children. 287 of them are girls. How many boys are there?
39. 39.A train has 233 people in the front coaches and 517 people in the back coaches. How many people are on the train?
40. 40.465 − ? = 199

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