Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 643 · 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. 1.857 + ? = 973
2. 2.161 + 595 =
3. 3.429 − 321 =
4. 4.A train has 506 people in the front coaches and 329 people in the back coaches. How many people are on the train?
5. 5.931 − 453 =
6. 6.233 − ? = 41
7. 7.553 − ? = 243
8. 8.735 + ? = 936
9. 9.804 − 575 =
10. 10.627 + ? = 889
11. 11.782 + 156 =
12. 12.432 − 386 =
13. 13.112 + 279 =
14. 14.? + 168 = 477
15. 15.? + 353 = 903
16. 16.553 − 262 =
17. 17.194 + 436 =
18. 18.928 − 755 =
19. 19.A school has 585 children. 482 of them are girls. How many boys are there?
20. 20.A train has 197 people in the front coaches and 191 people in the back coaches. How many people are on the train?
21. 21.801 − 478 =
22. 22.852 − 437 =
23. 23.202 − 111 =
24. 24.703 − ? = 209
25. 25.A school has 425 children. 173 of them are girls. How many boys are there?
26. 26.? − 210 = 718
27. 27.567 − 252 =
28. 28.? + 329 = 935
29. 29.A train has 641 people in the front coaches and 248 people in the back coaches. How many people are on the train?
30. 30.167 + 205 =
31. 31.? + 725 = 868
32. 32.423 − 257 =
33. 33.452 − 380 =
34. 34.827 + ? = 973
35. 35.605 + ? = 959
36. 36.? + 316 = 620
37. 37.A school has 341 children. 118 of them are girls. How many boys are there?
38. 38.554 + ? = 780
39. 39.848 − 169 =
40. 40.586 − 338 =

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