Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 624 · 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. 1.747 + 199 =
2. 2.796 − 564 =
3. 3.? + 335 = 536
4. 4.A school has 327 children. 195 of them are girls. How many boys are there?
5. 5.603 − ? = 471
6. 6.208 + 101 =
7. 7.430 − 152 =
8. 8.A school has 704 children. 283 of them are girls. How many boys are there?
9. 9.159 + 238 =
10. 10.? − 133 = 182
11. 11.? − 158 = 46
12. 12.A school has 255 children. 170 of them are girls. How many boys are there?
13. 13.236 + 232 =
14. 14.A school has 348 children. 299 of them are girls. How many boys are there?
15. 15.A school has 716 children. 678 of them are girls. How many boys are there?
16. 16.A school has 689 children. 589 of them are girls. How many boys are there?
17. 17.289 − 205 =
18. 18.455 + ? = 985
19. 19.431 − 347 =
20. 20.663 + 303 =
21. 21.? + 293 = 778
22. 22.414 − 290 =
23. 23.573 − ? = 25
24. 24.994 − 244 =
25. 25.? + 597 = 710
26. 26.? + 130 = 892
27. 27.623 + 155 =
28. 28.139 + 277 =
29. 29.A train has 709 people in the front coaches and 219 people in the back coaches. How many people are on the train?
30. 30.890 − 219 =
31. 31.584 + 402 =
32. 32.264 − ? = 34
33. 33.391 + ? = 945
34. 34.850 + 148 =
35. 35.177 + 244 =
36. 36.907 − 380 =
37. 37.A school has 781 children. 567 of them are girls. How many boys are there?
38. 38.759 + 220 =
39. 39.553 + 371 =
40. 40.? + 339 = 459

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