Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 232 · 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. 1.333 + 408 =
2. 2.182 + 525 =
3. 3.779 + 144 =
4. 4.886 + 105 =
5. 5.? − 571 = 423
6. 6.455 − ? = 76
7. 7.291 − 238 =
8. 8.A train has 819 people in the front coaches and 140 people in the back coaches. How many people are on the train?
9. 9.? + 784 = 918
10. 10.823 + 100 =
11. 11.350 − 203 =
12. 12.? + 718 = 918
13. 13.736 − 283 =
14. 14.828 + 132 =
15. 15.232 + 724 =
16. 16.? − 328 = 553
17. 17.886 − 113 =
18. 18.886 + 103 =
19. 19.248 − 136 =
20. 20.? + 840 = 990
21. 21.398 − 193 =
22. 22.305 − ? = 111
23. 23.211 − 204 =
24. 24.A train has 885 people in the front coaches and 100 people in the back coaches. How many people are on the train?
25. 25.? − 131 = 121
26. 26.642 − 114 =
27. 27.540 + ? = 808
28. 28.365 − 169 =
29. 29.A train has 346 people in the front coaches and 529 people in the back coaches. How many people are on the train?
30. 30.762 − ? = 379
31. 31.? + 876 = 992
32. 32.651 − 421 =
33. 33.A train has 312 people in the front coaches and 300 people in the back coaches. How many people are on the train?
34. 34.? + 804 = 911
35. 35.152 + 494 =
36. 36.A train has 715 people in the front coaches and 103 people in the back coaches. How many people are on the train?
37. 37.A school has 391 children. 150 of them are girls. How many boys are there?
38. 38.? + 406 = 898
39. 39.? − 179 = 202
40. 40.543 + 169 =

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