Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 28 · 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. 1.655 − ? = 73
2. 2.903 − 214 =
3. 3.198 + 463 =
4. 4.? + 883 = 994
5. 5.945 − ? = 836
6. 6.? − 305 = 407
7. 7.520 + 252 =
8. 8.767 + ? = 875
9. 9.? − 655 = 74
10. 10.875 + 124 =
11. 11.? + 785 = 909
12. 12.139 + 688 =
13. 13.A school has 715 children. 480 of them are girls. How many boys are there?
14. 14.164 + 581 =
15. 15.A train has 772 people in the front coaches and 134 people in the back coaches. How many people are on the train?
16. 16.A train has 729 people in the front coaches and 155 people in the back coaches. How many people are on the train?
17. 17.A school has 680 children. 236 of them are girls. How many boys are there?
18. 18.413 + 417 =
19. 19.A school has 349 children. 278 of them are girls. How many boys are there?
20. 20.A train has 762 people in the front coaches and 117 people in the back coaches. How many people are on the train?
21. 21.A school has 601 children. 156 of them are girls. How many boys are there?
22. 22.425 − 217 =
23. 23.A train has 627 people in the front coaches and 257 people in the back coaches. How many people are on the train?
24. 24.? − 394 = 399
25. 25.A train has 119 people in the front coaches and 568 people in the back coaches. How many people are on the train?
26. 26.616 − 351 =
27. 27.688 + ? = 981
28. 28.876 + ? = 990
29. 29.220 + ? = 559
30. 30.996 − 722 =
31. 31.324 + 197 =
32. 32.520 − 357 =
33. 33.508 − 371 =
34. 34.536 − ? = 356
35. 35.? − 328 = 613
36. 36.? + 746 = 935
37. 37.624 − 150 =
38. 38.355 − 108 =
39. 39.619 − 600 =
40. 40.806 + 134 =

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