Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 438 · 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. 1.193 + ? = 740
2. 2.536 − 349 =
3. 3.701 + 158 =
4. 4.429 − ? = 21
5. 5.? + 733 = 906
6. 6.558 − 498 =
7. 7.A school has 881 children. 125 of them are girls. How many boys are there?
8. 8.476 − 222 =
9. 9.? − 348 = 67
10. 10.A school has 862 children. 622 of them are girls. How many boys are there?
11. 11.554 − ? = 387
12. 12.241 − 217 =
13. 13.? − 293 = 217
14. 14.A school has 865 children. 705 of them are girls. How many boys are there?
15. 15.A train has 251 people in the front coaches and 741 people in the back coaches. How many people are on the train?
16. 16.A school has 544 children. 430 of them are girls. How many boys are there?
17. 17.662 − 535 =
18. 18.551 + ? = 862
19. 19.488 + 387 =
20. 20.412 − 172 =
21. 21.751 + ? = 881
22. 22.788 + 181 =
23. 23.? + 179 = 344
24. 24.A school has 946 children. 623 of them are girls. How many boys are there?
25. 25.632 + 307 =
26. 26.? − 363 = 195
27. 27.275 + 154 =
28. 28.A train has 249 people in the front coaches and 580 people in the back coaches. How many people are on the train?
29. 29.798 − 383 =
30. 30.332 − 178 =
31. 31.? − 119 = 159
32. 32.786 − ? = 665
33. 33.789 + ? = 920
34. 34.A school has 268 children. 253 of them are girls. How many boys are there?
35. 35.682 + 181 =
36. 36.507 − ? = 319
37. 37.741 + ? = 862
38. 38.A school has 787 children. 750 of them are girls. How many boys are there?
39. 39.238 − 105 =
40. 40.379 − 185 =

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