Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 492 · 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.? − 385 = 98
2. 2.? − 114 = 161
3. 3.966 − 145 =
4. 4.288 − 277 =
5. 5.? − 155 = 214
6. 6.? + 146 = 873
7. 7.797 − ? = 42
8. 8.? + 565 = 960
9. 9.A train has 811 people in the front coaches and 167 people in the back coaches. How many people are on the train?
10. 10.273 + 245 =
11. 11.320 − 101 =
12. 12.568 − 219 =
13. 13.233 − 137 =
14. 14.509 + 410 =
15. 15.344 + 368 =
16. 16.945 − 199 =
17. 17.A school has 804 children. 614 of them are girls. How many boys are there?
18. 18.494 − 399 =
19. 19.? + 739 = 956
20. 20.770 − 614 =
21. 21.535 − 378 =
22. 22.600 + ? = 790
23. 23.A train has 401 people in the front coaches and 395 people in the back coaches. How many people are on the train?
24. 24.951 − 445 =
25. 25.A school has 572 children. 516 of them are girls. How many boys are there?
26. 26.555 + 308 =
27. 27.354 + ? = 459
28. 28.337 − 157 =
29. 29.776 + 132 =
30. 30.640 − ? = 302
31. 31.347 − 108 =
32. 32.891 − ? = 156
33. 33.? − 512 = 112
34. 34.894 − ? = 96
35. 35.A school has 260 children. 257 of them are girls. How many boys are there?
36. 36.? + 735 = 895
37. 37.? − 122 = 80
38. 38.? + 583 = 765
39. 39.712 − 161 =
40. 40.A train has 200 people in the front coaches and 574 people in the back coaches. How many people are on the train?

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