Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 452 · 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.A train has 672 people in the front coaches and 128 people in the back coaches. How many people are on the train?
2. 2.A train has 814 people in the front coaches and 176 people in the back coaches. How many people are on the train?
3. 3.800 − ? = 1
4. 4.833 + ? = 998
5. 5.461 + 235 =
6. 6.358 − 333 =
7. 7.782 − 645 =
8. 8.674 − ? = 117
9. 9.715 − 705 =
10. 10.404 + ? = 932
11. 11.864 − 693 =
12. 12.A school has 275 children. 214 of them are girls. How many boys are there?
13. 13.904 − 154 =
14. 14.A school has 622 children. 325 of them are girls. How many boys are there?
15. 15.? − 125 = 129
16. 16.? + 586 = 991
17. 17.314 − 121 =
18. 18.830 − 351 =
19. 19.930 − 335 =
20. 20.354 + 276 =
21. 21.A train has 328 people in the front coaches and 528 people in the back coaches. How many people are on the train?
22. 22.? + 597 = 794
23. 23.832 − ? = 559
24. 24.A train has 291 people in the front coaches and 235 people in the back coaches. How many people are on the train?
25. 25.849 − 798 =
26. 26.A school has 311 children. 159 of them are girls. How many boys are there?
27. 27.799 − 233 =
28. 28.? + 304 = 645
29. 29.? − 341 = 195
30. 30.A train has 148 people in the front coaches and 758 people in the back coaches. How many people are on the train?
31. 31.411 + ? = 808
32. 32.179 + 129 =
33. 33.373 + ? = 541
34. 34.479 + ? = 630
35. 35.751 + ? = 874
36. 36.243 − 230 =
37. 37.250 − ? = 120
38. 38.971 − ? = 240
39. 39.644 − 535 =
40. 40.763 + ? = 948

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