Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 807 · 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.? + 243 = 858
2. 2.? + 318 = 997
3. 3.448 − 367 =
4. 4.838 − 321 =
5. 5.627 + 222 =
6. 6.260 + 389 =
7. 7.A train has 618 people in the front coaches and 283 people in the back coaches. How many people are on the train?
8. 8.818 − 695 =
9. 9.449 + 193 =
10. 10.? + 151 = 570
11. 11.516 + ? = 830
12. 12.A train has 514 people in the front coaches and 176 people in the back coaches. How many people are on the train?
13. 13.710 + 243 =
14. 14.459 + 501 =
15. 15.492 + 110 =
16. 16.? + 731 = 995
17. 17.615 + ? = 727
18. 18.A school has 201 children. 178 of them are girls. How many boys are there?
19. 19.A train has 557 people in the front coaches and 114 people in the back coaches. How many people are on the train?
20. 20.741 − 486 =
21. 21.A train has 869 people in the front coaches and 115 people in the back coaches. How many people are on the train?
22. 22.820 − 673 =
23. 23.413 − 199 =
24. 24.? + 410 = 918
25. 25.825 + ? = 943
26. 26.624 + ? = 959
27. 27.746 + 210 =
28. 28.A school has 225 children. 138 of them are girls. How many boys are there?
29. 29.432 − 145 =
30. 30.844 − 538 =
31. 31.725 + 264 =
32. 32.179 + ? = 798
33. 33.A train has 307 people in the front coaches and 638 people in the back coaches. How many people are on the train?
34. 34.276 + 206 =
35. 35.? − 277 = 428
36. 36.468 + 476 =
37. 37.187 + 164 =
38. 38.542 − 281 =
39. 39.A school has 419 children. 189 of them are girls. How many boys are there?
40. 40.565 − 389 =

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