Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 858 · 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. 1.786 − 466 =
2. 2.838 − 697 =
3. 3.364 − 266 =
4. 4.A school has 270 children. 153 of them are girls. How many boys are there?
5. 5.194 + ? = 504
6. 6.? + 790 = 972
7. 7.850 − 844 =
8. 8.? + 641 = 989
9. 9.A school has 710 children. 258 of them are girls. How many boys are there?
10. 10.871 + 128 =
11. 11.501 + 455 =
12. 12.A train has 144 people in the front coaches and 225 people in the back coaches. How many people are on the train?
13. 13.506 + ? = 887
14. 14.265 + 322 =
15. 15.727 + 188 =
16. 16.604 − 540 =
17. 17.A school has 756 children. 473 of them are girls. How many boys are there?
18. 18.923 − ? = 584
19. 19.? + 344 = 462
20. 20.? + 894 = 996
21. 21.423 + 417 =
22. 22.748 + 167 =
23. 23.458 − ? = 349
24. 24.531 + 188 =
25. 25.307 + 594 =
26. 26.664 + 191 =
27. 27.A train has 185 people in the front coaches and 359 people in the back coaches. How many people are on the train?
28. 28.400 + 312 =
29. 29.A school has 441 children. 381 of them are girls. How many boys are there?
30. 30.? + 259 = 787
31. 31.785 − ? = 238
32. 32.? + 310 = 584
33. 33.624 − ? = 405
34. 34.241 − ? = 123
35. 35.109 + ? = 469
36. 36.372 + 525 =
37. 37.A school has 329 children. 117 of them are girls. How many boys are there?
38. 38.A school has 903 children. 325 of them are girls. How many boys are there?
39. 39.A train has 712 people in the front coaches and 200 people in the back coaches. How many people are on the train?
40. 40.139 + 170 =

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