Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 774 · 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.? + 345 = 725
2. 2.589 + ? = 907
3. 3.337 − 164 =
4. 4.A school has 319 children. 170 of them are girls. How many boys are there?
5. 5.608 − 558 =
6. 6.887 + 104 =
7. 7.A train has 375 people in the front coaches and 514 people in the back coaches. How many people are on the train?
8. 8.114 + 761 =
9. 9.447 − 335 =
10. 10.225 + 467 =
11. 11.A school has 993 children. 613 of them are girls. How many boys are there?
12. 12.833 + 112 =
13. 13.A train has 500 people in the front coaches and 190 people in the back coaches. How many people are on the train?
14. 14.494 + 500 =
15. 15.648 − 638 =
16. 16.A school has 398 children. 295 of them are girls. How many boys are there?
17. 17.120 + 300 =
18. 18.599 − ? = 403
19. 19.491 − 358 =
20. 20.323 − 187 =
21. 21.? − 888 = 104
22. 22.? − 177 = 52
23. 23.369 − ? = 124
24. 24.272 − 166 =
25. 25.874 − 116 =
26. 26.235 − 135 =
27. 27.A school has 589 children. 223 of them are girls. How many boys are there?
28. 28.A train has 466 people in the front coaches and 404 people in the back coaches. How many people are on the train?
29. 29.842 − ? = 704
30. 30.870 − 379 =
31. 31.219 − 109 =
32. 32.270 − 188 =
33. 33.608 − 174 =
34. 34.? − 330 = 382
35. 35.A school has 816 children. 299 of them are girls. How many boys are there?
36. 36.? + 731 = 856
37. 37.578 − 310 =
38. 38.821 − 150 =
39. 39.120 + 166 =
40. 40.A school has 333 children. 326 of them are girls. How many boys are there?

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