Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 91 · 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. 1.723 + ? = 921
2. 2.285 − 106 =
3. 3.A school has 630 children. 510 of them are girls. How many boys are there?
4. 4.A school has 621 children. 567 of them are girls. How many boys are there?
5. 5.397 − 375 =
6. 6.A train has 605 people in the front coaches and 111 people in the back coaches. How many people are on the train?
7. 7.444 + 308 =
8. 8.? + 648 = 773
9. 9.? + 376 = 587
10. 10.816 − 169 =
11. 11.? − 273 = 61
12. 12.802 − 682 =
13. 13.A school has 526 children. 404 of them are girls. How many boys are there?
14. 14.667 − 116 =
15. 15.A train has 644 people in the front coaches and 230 people in the back coaches. How many people are on the train?
16. 16.A train has 641 people in the front coaches and 111 people in the back coaches. How many people are on the train?
17. 17.A school has 327 children. 118 of them are girls. How many boys are there?
18. 18.442 − 108 =
19. 19.235 + ? = 505
20. 20.218 + 487 =
21. 21.A train has 398 people in the front coaches and 381 people in the back coaches. How many people are on the train?
22. 22.? + 287 = 831
23. 23.A school has 879 children. 254 of them are girls. How many boys are there?
24. 24.790 − ? = 637
25. 25.? + 289 = 958
26. 26.632 + ? = 789
27. 27.A train has 696 people in the front coaches and 215 people in the back coaches. How many people are on the train?
28. 28.A train has 594 people in the front coaches and 289 people in the back coaches. How many people are on the train?
29. 29.874 + ? = 976
30. 30.292 − ? = 55
31. 31.A train has 555 people in the front coaches and 159 people in the back coaches. How many people are on the train?
32. 32.481 + ? = 955
33. 33.A train has 883 people in the front coaches and 106 people in the back coaches. How many people are on the train?
34. 34.A school has 346 children. 262 of them are girls. How many boys are there?
35. 35.A train has 761 people in the front coaches and 175 people in the back coaches. How many people are on the train?
36. 36.? + 592 = 788
37. 37.? + 763 = 963
38. 38.567 − ? = 386
39. 39.A school has 453 children. 430 of them are girls. How many boys are there?
40. 40.142 + 142 =

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