Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 12 · 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. 1.750 + 167 =
2. 2.566 − 206 =
3. 3.200 + 558 =
4. 4.? − 565 = 307
5. 5.A train has 185 people in the front coaches and 587 people in the back coaches. How many people are on the train?
6. 6.? + 613 = 941
7. 7.A train has 406 people in the front coaches and 146 people in the back coaches. How many people are on the train?
8. 8.111 + 505 =
9. 9.? − 100 = 134
10. 10.230 − ? = 30
11. 11.A train has 387 people in the front coaches and 265 people in the back coaches. How many people are on the train?
12. 12.206 + 316 =
13. 13.558 + 415 =
14. 14.204 + 399 =
15. 15.? − 229 = 205
16. 16.753 + 161 =
17. 17.A train has 628 people in the front coaches and 285 people in the back coaches. How many people are on the train?
18. 18.619 − 459 =
19. 19.? − 158 = 53
20. 20.711 + 134 =
21. 21.604 − 188 =
22. 22.A school has 695 children. 547 of them are girls. How many boys are there?
23. 23.? − 461 = 456
24. 24.? + 833 = 964
25. 25.440 − ? = 284
26. 26.216 − 191 =
27. 27.529 − 124 =
28. 28.? − 138 = 111
29. 29.455 − 327 =
30. 30.174 + 495 =
31. 31.599 − 386 =
32. 32.912 − 308 =
33. 33.214 + 284 =
34. 34.382 − 342 =
35. 35.733 + ? = 836
36. 36.656 + 165 =
37. 37.749 − 103 =
38. 38.973 − 244 =
39. 39.A train has 291 people in the front coaches and 450 people in the back coaches. How many people are on the train?
40. 40.? + 144 = 476

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