Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 478 · 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. 1.174 + ? = 612
2. 2.791 + 145 =
3. 3.? + 168 = 357
4. 4.886 + 112 =
5. 5.927 − ? = 478
6. 6.249 − 220 =
7. 7.118 + ? = 571
8. 8.277 − 240 =
9. 9.615 − 588 =
10. 10.? − 327 = 164
11. 11.597 − 506 =
12. 12.672 + 153 =
13. 13.769 − ? = 199
14. 14.200 + 148 =
15. 15.A school has 847 children. 821 of them are girls. How many boys are there?
16. 16.A train has 313 people in the front coaches and 354 people in the back coaches. How many people are on the train?
17. 17.? + 455 = 587
18. 18.A train has 625 people in the front coaches and 338 people in the back coaches. How many people are on the train?
19. 19.764 + 178 =
20. 20.A train has 117 people in the front coaches and 264 people in the back coaches. How many people are on the train?
21. 21.685 − 225 =
22. 22.465 − 349 =
23. 23.A school has 428 children. 208 of them are girls. How many boys are there?
24. 24.549 − ? = 197
25. 25.? − 193 = 89
26. 26.838 + 122 =
27. 27.A train has 228 people in the front coaches and 668 people in the back coaches. How many people are on the train?
28. 28.? + 193 = 396
29. 29.? − 224 = 150
30. 30.863 − 361 =
31. 31.325 + 419 =
32. 32.248 − 206 =
33. 33.A train has 686 people in the front coaches and 131 people in the back coaches. How many people are on the train?
34. 34.? + 251 = 568
35. 35.616 + 124 =
36. 36.? + 374 = 622
37. 37.492 − ? = 126
38. 38.876 + 109 =
39. 39.A train has 178 people in the front coaches and 652 people in the back coaches. How many people are on the train?
40. 40.? − 827 = 40

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