Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 377 · 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. 1.791 + 184 =
2. 2.A train has 733 people in the front coaches and 219 people in the back coaches. How many people are on the train?
3. 3.A school has 664 children. 129 of them are girls. How many boys are there?
4. 4.747 − ? = 639
5. 5.638 + 114 =
6. 6.788 + 190 =
7. 7.? + 597 = 716
8. 8.395 − 183 =
9. 9.841 + 137 =
10. 10.349 − ? = 208
11. 11.A train has 156 people in the front coaches and 608 people in the back coaches. How many people are on the train?
12. 12.275 + ? = 793
13. 13.795 − ? = 674
14. 14.A school has 928 children. 817 of them are girls. How many boys are there?
15. 15.310 − ? = 193
16. 16.636 − 116 =
17. 17.A school has 913 children. 807 of them are girls. How many boys are there?
18. 18.463 + 119 =
19. 19.532 + 118 =
20. 20.613 + 136 =
21. 21.? − 215 = 240
22. 22.295 + 452 =
23. 23.165 + ? = 385
24. 24.573 + 320 =
25. 25.A school has 514 children. 509 of them are girls. How many boys are there?
26. 26.A train has 855 people in the front coaches and 115 people in the back coaches. How many people are on the train?
27. 27.? − 236 = 412
28. 28.852 + 125 =
29. 29.? + 179 = 809
30. 30.206 + ? = 496
31. 31.129 + 798 =
32. 32.182 + 126 =
33. 33.737 − 511 =
34. 34.379 − 174 =
35. 35.A school has 224 children. 145 of them are girls. How many boys are there?
36. 36.A school has 775 children. 584 of them are girls. How many boys are there?
37. 37.440 − 356 =
38. 38.A train has 572 people in the front coaches and 342 people in the back coaches. How many people are on the train?
39. 39.? + 639 = 850
40. 40.? − 588 = 109

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