Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 412 · 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. 1.393 − 263 =
2. 2.A train has 376 people in the front coaches and 238 people in the back coaches. How many people are on the train?
3. 3.601 + 383 =
4. 4.? + 217 = 809
5. 5.863 − ? = 518
6. 6.? − 230 = 20
7. 7.337 + 587 =
8. 8.271 + 700 =
9. 9.851 + ? = 978
10. 10.? + 578 = 908
11. 11.773 + 226 =
12. 12.A train has 665 people in the front coaches and 137 people in the back coaches. How many people are on the train?
13. 13.A school has 579 children. 447 of them are girls. How many boys are there?
14. 14.? − 539 = 164
15. 15.A train has 620 people in the front coaches and 243 people in the back coaches. How many people are on the train?
16. 16.628 − 279 =
17. 17.316 + ? = 905
18. 18.530 + 390 =
19. 19.872 − ? = 498
20. 20.A school has 949 children. 884 of them are girls. How many boys are there?
21. 21.529 + 440 =
22. 22.477 + 110 =
23. 23.A school has 863 children. 708 of them are girls. How many boys are there?
24. 24.157 + 782 =
25. 25.? + 230 = 418
26. 26.627 − 124 =
27. 27.514 + ? = 661
28. 28.? + 304 = 804
29. 29.884 + ? = 985
30. 30.538 − 307 =
31. 31.682 + ? = 913
32. 32.A school has 816 children. 641 of them are girls. How many boys are there?
33. 33.466 + ? = 615
34. 34.A school has 720 children. 204 of them are girls. How many boys are there?
35. 35.759 − 241 =
36. 36.296 + 130 =
37. 37.720 + 187 =
38. 38.? − 852 = 88
39. 39.397 − 244 =
40. 40.647 + 165 =

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