Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 811 · 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. 1.521 + 246 =
2. 2.471 + 508 =
3. 3.? + 829 = 934
4. 4.? − 211 = 588
5. 5.? + 639 = 887
6. 6.299 − 281 =
7. 7.331 + ? = 459
8. 8.223 − 154 =
9. 9.A school has 269 children. 150 of them are girls. How many boys are there?
10. 10.? − 225 = 640
11. 11.560 − ? = 97
12. 12.A train has 662 people in the front coaches and 121 people in the back coaches. How many people are on the train?
13. 13.276 + 719 =
14. 14.396 + 322 =
15. 15.A train has 685 people in the front coaches and 159 people in the back coaches. How many people are on the train?
16. 16.758 − ? = 129
17. 17.786 − 619 =
18. 18.400 − 374 =
19. 19.215 − 150 =
20. 20.A school has 635 children. 605 of them are girls. How many boys are there?
21. 21.868 − 221 =
22. 22.? + 126 = 889
23. 23.A train has 120 people in the front coaches and 258 people in the back coaches. How many people are on the train?
24. 24.617 − 567 =
25. 25.868 + 121 =
26. 26.982 − 330 =
27. 27.875 − 538 =
28. 28.231 + 587 =
29. 29.583 − 294 =
30. 30.A train has 544 people in the front coaches and 309 people in the back coaches. How many people are on the train?
31. 31.494 − 325 =
32. 32.A train has 215 people in the front coaches and 276 people in the back coaches. How many people are on the train?
33. 33.? + 192 = 301
34. 34.156 + 408 =
35. 35.? − 167 = 350
36. 36.869 + 130 =
37. 37.553 − 318 =
38. 38.141 + 572 =
39. 39.807 + 188 =
40. 40.635 − 469 =

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