Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 994 · 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. 1.209 − ? = 5
2. 2.720 + 265 =
3. 3.153 + 648 =
4. 4.787 + ? = 914
5. 5.790 + 104 =
6. 6.A school has 809 children. 793 of them are girls. How many boys are there?
7. 7.818 − ? = 403
8. 8.A school has 464 children. 265 of them are girls. How many boys are there?
9. 9.567 + ? = 784
10. 10.972 − ? = 53
11. 11.798 + ? = 975
12. 12.248 − 182 =
13. 13.623 + ? = 955
14. 14.A school has 275 children. 259 of them are girls. How many boys are there?
15. 15.A school has 886 children. 171 of them are girls. How many boys are there?
16. 16.401 − 299 =
17. 17.? − 597 = 303
18. 18.A school has 697 children. 482 of them are girls. How many boys are there?
19. 19.833 − 120 =
20. 20.? − 467 = 152
21. 21.676 + 303 =
22. 22.A train has 803 people in the front coaches and 104 people in the back coaches. How many people are on the train?
23. 23.A train has 250 people in the front coaches and 237 people in the back coaches. How many people are on the train?
24. 24.279 − ? = 162
25. 25.899 + ? = 999
26. 26.? − 595 = 263
27. 27.663 + 212 =
28. 28.256 + 703 =
29. 29.346 − 308 =
30. 30.? − 197 = 41
31. 31.A train has 352 people in the front coaches and 236 people in the back coaches. How many people are on the train?
32. 32.185 + 224 =
33. 33.440 + 472 =
34. 34.571 − 288 =
35. 35.A train has 490 people in the front coaches and 404 people in the back coaches. How many people are on the train?
36. 36.123 + 446 =
37. 37.686 − 576 =
38. 38.971 − 718 =
39. 39.436 + 470 =
40. 40.195 + 394 =

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