Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 547 · 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. 1.833 + ? = 991
2. 2.393 + 427 =
3. 3.A school has 325 children. 147 of them are girls. How many boys are there?
4. 4.328 − 152 =
5. 5.798 − 614 =
6. 6.997 − 279 =
7. 7.428 − 207 =
8. 8.656 − 542 =
9. 9.A train has 523 people in the front coaches and 172 people in the back coaches. How many people are on the train?
10. 10.A train has 595 people in the front coaches and 402 people in the back coaches. How many people are on the train?
11. 11.130 + ? = 497
12. 12.412 − 387 =
13. 13.465 − 411 =
14. 14.713 − ? = 442
15. 15.671 + 180 =
16. 16.891 + 106 =
17. 17.614 + 330 =
18. 18.? + 300 = 424
19. 19.878 + 118 =
20. 20.? + 334 = 496
21. 21.528 − 250 =
22. 22.739 − 386 =
23. 23.478 + 376 =
24. 24.A school has 965 children. 506 of them are girls. How many boys are there?
25. 25.302 − 111 =
26. 26.775 − 313 =
27. 27.A school has 398 children. 275 of them are girls. How many boys are there?
28. 28.655 + 268 =
29. 29.238 + ? = 407
30. 30.? + 627 = 981
31. 31.? − 669 = 301
32. 32.225 + ? = 573
33. 33.720 + ? = 986
34. 34.739 − 699 =
35. 35.A school has 981 children. 257 of them are girls. How many boys are there?
36. 36.A train has 711 people in the front coaches and 175 people in the back coaches. How many people are on the train?
37. 37.A train has 194 people in the front coaches and 608 people in the back coaches. How many people are on the train?
38. 38.412 + 419 =
39. 39.205 + 539 =
40. 40.? + 431 = 557

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