Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 914 · 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. 1.972 − 618 =
2. 2.A school has 628 children. 615 of them are girls. How many boys are there?
3. 3.331 − 160 =
4. 4.? + 705 = 907
5. 5.457 + 105 =
6. 6.108 + 124 =
7. 7.984 − 824 =
8. 8.A school has 504 children. 478 of them are girls. How many boys are there?
9. 9.238 − 119 =
10. 10.A train has 506 people in the front coaches and 469 people in the back coaches. How many people are on the train?
11. 11.541 + 455 =
12. 12.A train has 624 people in the front coaches and 118 people in the back coaches. How many people are on the train?
13. 13.? − 650 = 319
14. 14.A school has 775 children. 174 of them are girls. How many boys are there?
15. 15.A school has 374 children. 228 of them are girls. How many boys are there?
16. 16.A train has 489 people in the front coaches and 242 people in the back coaches. How many people are on the train?
17. 17.A train has 106 people in the front coaches and 564 people in the back coaches. How many people are on the train?
18. 18.255 + 740 =
19. 19.? + 386 = 879
20. 20.A school has 929 children. 925 of them are girls. How many boys are there?
21. 21.659 − 134 =
22. 22.A train has 466 people in the front coaches and 475 people in the back coaches. How many people are on the train?
23. 23.A school has 855 children. 733 of them are girls. How many boys are there?
24. 24.458 − ? = 352
25. 25.573 − 566 =
26. 26.131 + 747 =
27. 27.A train has 818 people in the front coaches and 159 people in the back coaches. How many people are on the train?
28. 28.A train has 735 people in the front coaches and 144 people in the back coaches. How many people are on the train?
29. 29.A train has 207 people in the front coaches and 227 people in the back coaches. How many people are on the train?
30. 30.551 + 211 =
31. 31.289 + 269 =
32. 32.? + 635 = 984
33. 33.A school has 865 children. 281 of them are girls. How many boys are there?
34. 34.357 + ? = 675
35. 35.A train has 569 people in the front coaches and 268 people in the back coaches. How many people are on the train?
36. 36.794 + 204 =
37. 37.447 + 386 =
38. 38.707 + ? = 833
39. 39.835 − 744 =
40. 40.A school has 683 children. 216 of them are girls. How many boys are there?

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