Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 24 · 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. 1.744 + 107 =
2. 2.988 − 499 =
3. 3.686 + ? = 980
4. 4.202 + ? = 597
5. 5.319 + 555 =
6. 6.391 + ? = 959
7. 7.701 + ? = 983
8. 8.194 + 532 =
9. 9.103 + 129 =
10. 10.? + 333 = 446
11. 11.? − 188 = 94
12. 12.A school has 735 children. 215 of them are girls. How many boys are there?
13. 13.784 + ? = 964
14. 14.594 − 331 =
15. 15.424 − 280 =
16. 16.388 − 224 =
17. 17.700 + 249 =
18. 18.735 − 152 =
19. 19.A train has 556 people in the front coaches and 293 people in the back coaches. How many people are on the train?
20. 20.? − 291 = 627
21. 21.294 + ? = 992
22. 22.402 − 130 =
23. 23.? − 268 = 519
24. 24.646 + 112 =
25. 25.A school has 750 children. 518 of them are girls. How many boys are there?
26. 26.123 + 629 =
27. 27.799 + 166 =
28. 28.A school has 827 children. 119 of them are girls. How many boys are there?
29. 29.148 + 521 =
30. 30.A train has 554 people in the front coaches and 358 people in the back coaches. How many people are on the train?
31. 31.A train has 725 people in the front coaches and 156 people in the back coaches. How many people are on the train?
32. 32.? + 871 = 990
33. 33.671 + 216 =
34. 34.310 − ? = 196
35. 35.707 − ? = 251
36. 36.429 + 269 =
37. 37.848 − ? = 457
38. 38.? + 653 = 874
39. 39.263 − 245 =
40. 40.A school has 833 children. 245 of them are girls. How many boys are there?

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