Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 144 · 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. 1.288 − 202 =
2. 2.414 − 261 =
3. 3.314 − 175 =
4. 4.945 − 522 =
5. 5.495 + 478 =
6. 6.? + 677 = 866
7. 7.487 + 163 =
8. 8.756 − ? = 134
9. 9.945 − 161 =
10. 10.453 − ? = 226
11. 11.A train has 534 people in the front coaches and 236 people in the back coaches. How many people are on the train?
12. 12.A school has 658 children. 141 of them are girls. How many boys are there?
13. 13.167 + 222 =
14. 14.207 + ? = 371
15. 15.? + 276 = 969
16. 16.967 − ? = 771
17. 17.? − 189 = 67
18. 18.168 + ? = 906
19. 19.903 − ? = 645
20. 20.A train has 462 people in the front coaches and 342 people in the back coaches. How many people are on the train?
21. 21.? − 466 = 149
22. 22.A train has 228 people in the front coaches and 656 people in the back coaches. How many people are on the train?
23. 23.A school has 408 children. 262 of them are girls. How many boys are there?
24. 24.329 + 179 =
25. 25.A school has 565 children. 168 of them are girls. How many boys are there?
26. 26.A school has 340 children. 218 of them are girls. How many boys are there?
27. 27.359 − ? = 237
28. 28.? + 302 = 430
29. 29.253 + 603 =
30. 30.568 − 301 =
31. 31.683 − ? = 534
32. 32.663 − 514 =
33. 33.A school has 343 children. 268 of them are girls. How many boys are there?
34. 34.228 − ? = 119
35. 35.562 + ? = 853
36. 36.829 − 251 =
37. 37.588 − ? = 393
38. 38.568 + 146 =
39. 39.308 − 212 =
40. 40.? + 882 = 986

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