Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 240 · 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. 1.666 + 198 =
2. 2.A train has 770 people in the front coaches and 106 people in the back coaches. How many people are on the train?
3. 3.474 + ? = 643
4. 4.715 − 574 =
5. 5.A school has 689 children. 688 of them are girls. How many boys are there?
6. 6.662 + 234 =
7. 7.329 − 290 =
8. 8.753 − 533 =
9. 9.? − 455 = 526
10. 10.499 + 225 =
11. 11.618 − 264 =
12. 12.253 + 210 =
13. 13.551 + 286 =
14. 14.192 + 270 =
15. 15.246 − 186 =
16. 16.712 + ? = 882
17. 17.A school has 442 children. 287 of them are girls. How many boys are there?
18. 18.457 − 162 =
19. 19.656 + 268 =
20. 20.? − 463 = 51
21. 21.A school has 878 children. 182 of them are girls. How many boys are there?
22. 22.145 + ? = 603
23. 23.874 − ? = 698
24. 24.? + 466 = 835
25. 25.? + 743 = 952
26. 26.? + 814 = 949
27. 27.A train has 178 people in the front coaches and 102 people in the back coaches. How many people are on the train?
28. 28.? + 644 = 839
29. 29.390 − 388 =
30. 30.A school has 902 children. 811 of them are girls. How many boys are there?
31. 31.A train has 898 people in the front coaches and 101 people in the back coaches. How many people are on the train?
32. 32.339 − ? = 224
33. 33.764 + ? = 908
34. 34.490 + 139 =
35. 35.623 + 373 =
36. 36.272 − 122 =
37. 37.A train has 838 people in the front coaches and 113 people in the back coaches. How many people are on the train?
38. 38.480 + ? = 761
39. 39.894 + 102 =
40. 40.294 − ? = 177

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