Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 961 · 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. 1.898 + 101 =
2. 2.? + 586 = 751
3. 3.A school has 810 children. 476 of them are girls. How many boys are there?
4. 4.234 − 142 =
5. 5.834 + 140 =
6. 6.700 + 232 =
7. 7.? + 584 = 774
8. 8.539 − ? = 16
9. 9.? − 105 = 657
10. 10.380 − 133 =
11. 11.A school has 744 children. 542 of them are girls. How many boys are there?
12. 12.? − 301 = 240
13. 13.140 + ? = 540
14. 14.? − 152 = 241
15. 15.A school has 496 children. 493 of them are girls. How many boys are there?
16. 16.536 + 172 =
17. 17.640 + ? = 968
18. 18.A school has 588 children. 299 of them are girls. How many boys are there?
19. 19.800 + 159 =
20. 20.409 − ? = 63
21. 21.A school has 718 children. 381 of them are girls. How many boys are there?
22. 22.? − 340 = 134
23. 23.220 + ? = 381
24. 24.A school has 357 children. 337 of them are girls. How many boys are there?
25. 25.702 − 485 =
26. 26.? + 155 = 627
27. 27.812 − 245 =
28. 28.259 − ? = 86
29. 29.? + 575 = 787
30. 30.984 − 945 =
31. 31.436 − ? = 13
32. 32.451 + 392 =
33. 33.A train has 636 people in the front coaches and 197 people in the back coaches. How many people are on the train?
34. 34.312 + ? = 641
35. 35.561 + ? = 861
36. 36.507 + 436 =
37. 37.319 − 252 =
38. 38.A school has 369 children. 188 of them are girls. How many boys are there?
39. 39.498 + 162 =
40. 40.394 − 135 =

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