Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 695 · 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. 1.259 − 142 =
2. 2.? − 455 = 384
3. 3.330 + 144 =
4. 4.754 + ? = 894
5. 5.A school has 207 children. 164 of them are girls. How many boys are there?
6. 6.384 − 171 =
7. 7.743 + ? = 911
8. 8.851 − 497 =
9. 9.? + 172 = 730
10. 10.689 − 135 =
11. 11.475 + 232 =
12. 12.720 − 437 =
13. 13.289 − ? = 177
14. 14.543 − 389 =
15. 15.A school has 433 children. 162 of them are girls. How many boys are there?
16. 16.? + 185 = 914
17. 17.709 + ? = 966
18. 18.989 − 315 =
19. 19.A school has 862 children. 771 of them are girls. How many boys are there?
20. 20.? + 291 = 630
21. 21.418 + 182 =
22. 22.550 + ? = 968
23. 23.786 + 165 =
24. 24.663 − ? = 549
25. 25.A train has 207 people in the front coaches and 592 people in the back coaches. How many people are on the train?
26. 26.A school has 572 children. 157 of them are girls. How many boys are there?
27. 27.797 − 143 =
28. 28.A train has 679 people in the front coaches and 225 people in the back coaches. How many people are on the train?
29. 29.? − 135 = 185
30. 30.? + 221 = 376
31. 31.A school has 297 children. 110 of them are girls. How many boys are there?
32. 32.691 + 221 =
33. 33.253 − ? = 8
34. 34.605 + ? = 926
35. 35.816 − ? = 579
36. 36.A school has 333 children. 229 of them are girls. How many boys are there?
37. 37.602 − 205 =
38. 38.? − 426 = 280
39. 39.A school has 949 children. 460 of them are girls. How many boys are there?
40. 40.157 + 344 =

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