Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 522 · 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.? − 353 = 2
2. 2.298 − 176 =
3. 3.699 − ? = 475
4. 4.458 − 219 =
5. 5.526 + 413 =
6. 6.780 − 726 =
7. 7.539 + 123 =
8. 8.979 − 302 =
9. 9.374 − 193 =
10. 10.? + 171 = 960
11. 11.377 − ? = 129
12. 12.875 − 185 =
13. 13.A school has 868 children. 193 of them are girls. How many boys are there?
14. 14.848 + ? = 950
15. 15.221 − 160 =
16. 16.480 + 496 =
17. 17.149 + ? = 528
18. 18.625 − 391 =
19. 19.A train has 868 people in the front coaches and 115 people in the back coaches. How many people are on the train?
20. 20.? − 172 = 426
21. 21.A train has 387 people in the front coaches and 354 people in the back coaches. How many people are on the train?
22. 22.? + 238 = 698
23. 23.217 + 270 =
24. 24.400 − ? = 29
25. 25.305 − ? = 183
26. 26.289 − ? = 31
27. 27.A train has 609 people in the front coaches and 257 people in the back coaches. How many people are on the train?
28. 28.A train has 533 people in the front coaches and 334 people in the back coaches. How many people are on the train?
29. 29.204 − ? = 100
30. 30.A school has 386 children. 356 of them are girls. How many boys are there?
31. 31.289 − 202 =
32. 32.A school has 593 children. 340 of them are girls. How many boys are there?
33. 33.416 + 301 =
34. 34.895 − ? = 453
35. 35.? + 863 = 968
36. 36.621 + ? = 923
37. 37.580 − 289 =
38. 38.433 + 486 =
39. 39.326 − ? = 129
40. 40.916 − ? = 108

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