Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 417 · 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 400 children. 227 of them are girls. How many boys are there?
2. 2.223 + 246 =
3. 3.A school has 218 children. 149 of them are girls. How many boys are there?
4. 4.408 − ? = 54
5. 5.785 − 173 =
6. 6.464 − 212 =
7. 7.322 + 323 =
8. 8.933 − ? = 376
9. 9.179 + 391 =
10. 10.? − 646 = 64
11. 11.A train has 372 people in the front coaches and 393 people in the back coaches. How many people are on the train?
12. 12.828 − 240 =
13. 13.545 + 303 =
14. 14.598 + 291 =
15. 15.687 − 214 =
16. 16.784 − 701 =
17. 17.535 + ? = 711
18. 18.426 − 413 =
19. 19.? + 827 = 997
20. 20.587 − 280 =
21. 21.A school has 572 children. 481 of them are girls. How many boys are there?
22. 22.? + 259 = 679
23. 23.648 + ? = 840
24. 24.690 + ? = 805
25. 25.A train has 306 people in the front coaches and 668 people in the back coaches. How many people are on the train?
26. 26.422 − 272 =
27. 27.159 + 566 =
28. 28.123 + 236 =
29. 29.557 + ? = 898
30. 30.390 + 123 =
31. 31.203 + 606 =
32. 32.A train has 275 people in the front coaches and 188 people in the back coaches. How many people are on the train?
33. 33.100 + ? = 443
34. 34.? + 274 = 787
35. 35.? − 407 = 26
36. 36.A train has 882 people in the front coaches and 111 people in the back coaches. How many people are on the train?
37. 37.A school has 784 children. 325 of them are girls. How many boys are there?
38. 38.A school has 667 children. 236 of them are girls. How many boys are there?
39. 39.? + 104 = 652
40. 40.268 + ? = 633

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