Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 948 · 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 school has 678 children. 544 of them are girls. How many boys are there?
2. 2.435 + 222 =
3. 3.863 + ? = 986
4. 4.892 + ? = 998
5. 5.A train has 401 people in the front coaches and 180 people in the back coaches. How many people are on the train?
6. 6.A train has 459 people in the front coaches and 404 people in the back coaches. How many people are on the train?
7. 7.A school has 915 children. 417 of them are girls. How many boys are there?
8. 8.A train has 558 people in the front coaches and 350 people in the back coaches. How many people are on the train?
9. 9.556 + 253 =
10. 10.761 + ? = 882
11. 11.312 − 123 =
12. 12.A train has 627 people in the front coaches and 290 people in the back coaches. How many people are on the train?
13. 13.613 − ? = 444
14. 14.A school has 641 children. 169 of them are girls. How many boys are there?
15. 15.573 + 315 =
16. 16.557 + 252 =
17. 17.A school has 413 children. 352 of them are girls. How many boys are there?
18. 18.? − 191 = 284
19. 19.A train has 321 people in the front coaches and 442 people in the back coaches. How many people are on the train?
20. 20.A school has 279 children. 263 of them are girls. How many boys are there?
21. 21.470 + ? = 655
22. 22.927 − 334 =
23. 23.103 + ? = 639
24. 24.A train has 123 people in the front coaches and 726 people in the back coaches. How many people are on the train?
25. 25.140 + 737 =
26. 26.713 − ? = 213
27. 27.698 + 262 =
28. 28.833 + 162 =
29. 29.A train has 727 people in the front coaches and 166 people in the back coaches. How many people are on the train?
30. 30.A school has 566 children. 522 of them are girls. How many boys are there?
31. 31.672 − 288 =
32. 32.? − 954 = 5
33. 33.A train has 812 people in the front coaches and 147 people in the back coaches. How many people are on the train?
34. 34.856 + ? = 978
35. 35.? − 142 = 202
36. 36.A school has 967 children. 692 of them are girls. How many boys are there?
37. 37.103 + ? = 364
38. 38.A train has 109 people in the front coaches and 408 people in the back coaches. How many people are on the train?
39. 39.183 + ? = 968
40. 40.798 + ? = 941

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