Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 958 · 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. 1.765 + ? = 895
2. 2.A train has 329 people in the front coaches and 472 people in the back coaches. How many people are on the train?
3. 3.405 − 203 =
4. 4.304 + 276 =
5. 5.482 + 107 =
6. 6.132 + 860 =
7. 7.392 − 229 =
8. 8.959 − 127 =
9. 9.? + 645 = 990
10. 10.475 − 331 =
11. 11.? − 237 = 28
12. 12.A train has 708 people in the front coaches and 287 people in the back coaches. How many people are on the train?
13. 13.248 − ? = 52
14. 14.A school has 554 children. 212 of them are girls. How many boys are there?
15. 15.205 − ? = 97
16. 16.114 + 284 =
17. 17.324 − ? = 114
18. 18.554 + 145 =
19. 19.121 + ? = 344
20. 20.861 + ? = 993
21. 21.200 − 180 =
22. 22.? + 139 = 607
23. 23.A school has 675 children. 479 of them are girls. How many boys are there?
24. 24.A school has 351 children. 208 of them are girls. How many boys are there?
25. 25.700 + 142 =
26. 26.A train has 824 people in the front coaches and 141 people in the back coaches. How many people are on the train?
27. 27.? − 474 = 176
28. 28.314 − ? = 104
29. 29.372 + 603 =
30. 30.? + 745 = 989
31. 31.A school has 961 children. 131 of them are girls. How many boys are there?
32. 32.116 + 504 =
33. 33.691 − 213 =
34. 34.? − 215 = 464
35. 35.245 − 209 =
36. 36.A school has 903 children. 896 of them are girls. How many boys are there?
37. 37.542 − 171 =
38. 38.A school has 933 children. 626 of them are girls. How many boys are there?
39. 39.? + 892 = 997
40. 40.454 − 252 =

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