Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 312 · 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.? + 406 = 536
2. 2.A school has 811 children. 317 of them are girls. How many boys are there?
3. 3.820 + 112 =
4. 4.568 − ? = 181
5. 5.A train has 141 people in the front coaches and 277 people in the back coaches. How many people are on the train?
6. 6.A school has 364 children. 257 of them are girls. How many boys are there?
7. 7.119 + ? = 678
8. 8.949 − 502 =
9. 9.910 − ? = 141
10. 10.109 + 770 =
11. 11.694 + 236 =
12. 12.352 + ? = 512
13. 13.667 + 178 =
14. 14.330 + 214 =
15. 15.238 − 181 =
16. 16.763 + 160 =
17. 17.840 + ? = 978
18. 18.886 + 106 =
19. 19.A school has 756 children. 625 of them are girls. How many boys are there?
20. 20.A train has 270 people in the front coaches and 311 people in the back coaches. How many people are on the train?
21. 21.423 + ? = 657
22. 22.A train has 668 people in the front coaches and 169 people in the back coaches. How many people are on the train?
23. 23.A train has 350 people in the front coaches and 427 people in the back coaches. How many people are on the train?
24. 24.A school has 472 children. 316 of them are girls. How many boys are there?
25. 25.? − 388 = 287
26. 26.A school has 945 children. 810 of them are girls. How many boys are there?
27. 27.165 + 450 =
28. 28.? − 177 = 501
29. 29.807 + 146 =
30. 30.749 + ? = 962
31. 31.A school has 769 children. 141 of them are girls. How many boys are there?
32. 32.435 − 388 =
33. 33.572 − 214 =
34. 34.? − 104 = 876
35. 35.958 − ? = 637
36. 36.? − 218 = 18
37. 37.196 + 328 =
38. 38.220 + 572 =
39. 39.221 + 452 =
40. 40.? − 120 = 190

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