Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 817 · 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. 1.765 + 174 =
2. 2.A school has 998 children. 501 of them are girls. How many boys are there?
3. 3.586 − 566 =
4. 4.295 − ? = 108
5. 5.228 + 158 =
6. 6.430 + 307 =
7. 7.706 + 151 =
8. 8.? − 450 = 181
9. 9.325 + ? = 745
10. 10.A train has 407 people in the front coaches and 566 people in the back coaches. How many people are on the train?
11. 11.A school has 712 children. 463 of them are girls. How many boys are there?
12. 12.A train has 890 people in the front coaches and 109 people in the back coaches. How many people are on the train?
13. 13.625 − 246 =
14. 14.? + 666 = 895
15. 15.? + 888 = 997
16. 16.604 − ? = 293
17. 17.? − 485 = 9
18. 18.? + 534 = 688
19. 19.873 − 430 =
20. 20.A train has 493 people in the front coaches and 407 people in the back coaches. How many people are on the train?
21. 21.292 + ? = 440
22. 22.A school has 928 children. 649 of them are girls. How many boys are there?
23. 23.331 + 601 =
24. 24.A school has 495 children. 475 of them are girls. How many boys are there?
25. 25.383 − 360 =
26. 26.A train has 283 people in the front coaches and 282 people in the back coaches. How many people are on the train?
27. 27.487 + 186 =
28. 28.A train has 135 people in the front coaches and 811 people in the back coaches. How many people are on the train?
29. 29.454 + ? = 652
30. 30.651 − 105 =
31. 31.636 + ? = 793
32. 32.550 − 370 =
33. 33.466 + ? = 706
34. 34.716 − ? = 273
35. 35.? + 380 = 527
36. 36.238 + ? = 861
37. 37.974 − 352 =
38. 38.841 + 118 =
39. 39.617 + 150 =
40. 40.113 + 289 =

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