Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 955 · 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. 1.444 + 117 =
2. 2.202 − ? = 4
3. 3.? − 299 = 40
4. 4.537 + 206 =
5. 5.? + 824 = 991
6. 6.833 − 405 =
7. 7.565 + 133 =
8. 8.A school has 581 children. 176 of them are girls. How many boys are there?
9. 9.667 + ? = 916
10. 10.603 + 159 =
11. 11.A school has 908 children. 750 of them are girls. How many boys are there?
12. 12.A school has 562 children. 195 of them are girls. How many boys are there?
13. 13.A school has 677 children. 186 of them are girls. How many boys are there?
14. 14.284 − 103 =
15. 15.881 − ? = 740
16. 16.180 + 633 =
17. 17.A school has 259 children. 117 of them are girls. How many boys are there?
18. 18.693 − ? = 521
19. 19.? − 228 = 517
20. 20.530 + 117 =
21. 21.A train has 201 people in the front coaches and 797 people in the back coaches. How many people are on the train?
22. 22.A train has 835 people in the front coaches and 138 people in the back coaches. How many people are on the train?
23. 23.486 − ? = 351
24. 24.199 + 536 =
25. 25.A school has 856 children. 736 of them are girls. How many boys are there?
26. 26.A train has 826 people in the front coaches and 152 people in the back coaches. How many people are on the train?
27. 27.A school has 304 children. 240 of them are girls. How many boys are there?
28. 28.202 + 382 =
29. 29.A school has 614 children. 455 of them are girls. How many boys are there?
30. 30.A school has 260 children. 159 of them are girls. How many boys are there?
31. 31.A school has 872 children. 152 of them are girls. How many boys are there?
32. 32.558 − ? = 293
33. 33.? + 504 = 854
34. 34.A school has 588 children. 282 of them are girls. How many boys are there?
35. 35.? + 177 = 475
36. 36.? + 858 = 991
37. 37.A train has 768 people in the front coaches and 204 people in the back coaches. How many people are on the train?
38. 38.A train has 155 people in the front coaches and 646 people in the back coaches. How many people are on the train?
39. 39.A train has 486 people in the front coaches and 483 people in the back coaches. How many people are on the train?
40. 40.? + 428 = 613

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