Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 921 · 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.A train has 690 people in the front coaches and 246 people in the back coaches. How many people are on the train?
2. 2.293 − ? = 54
3. 3.481 + 397 =
4. 4.776 − ? = 319
5. 5.A school has 744 children. 475 of them are girls. How many boys are there?
6. 6.? + 227 = 342
7. 7.A school has 763 children. 544 of them are girls. How many boys are there?
8. 8.153 + 587 =
9. 9.A train has 146 people in the front coaches and 165 people in the back coaches. How many people are on the train?
10. 10.540 − 445 =
11. 11.317 − ? = 125
12. 12.943 − ? = 564
13. 13.? − 132 = 320
14. 14.722 − 301 =
15. 15.239 + 370 =
16. 16.? − 648 = 1
17. 17.412 − ? = 311
18. 18.? − 128 = 184
19. 19.? + 849 = 951
20. 20.950 − 730 =
21. 21.480 + 201 =
22. 22.772 − ? = 474
23. 23.873 + ? = 986
24. 24.817 − 490 =
25. 25.430 + 241 =
26. 26.A school has 384 children. 170 of them are girls. How many boys are there?
27. 27.779 + 189 =
28. 28.? − 712 = 22
29. 29.? + 199 = 637
30. 30.417 + ? = 578
31. 31.A train has 262 people in the front coaches and 684 people in the back coaches. How many people are on the train?
32. 32.636 − 236 =
33. 33.329 + 148 =
34. 34.? + 825 = 938
35. 35.? + 362 = 999
36. 36.978 − 834 =
37. 37.604 − ? = 446
38. 38.A school has 240 children. 178 of them are girls. How many boys are there?
39. 39.906 − 446 =
40. 40.811 + ? = 932

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