Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 792 · 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.? + 224 = 972
2. 2.803 − 225 =
3. 3.648 − 416 =
4. 4.? − 292 = 513
5. 5.795 + ? = 978
6. 6.607 + 104 =
7. 7.369 + 595 =
8. 8.987 − 153 =
9. 9.395 + ? = 797
10. 10.264 − ? = 112
11. 11.784 + 140 =
12. 12.A train has 418 people in the front coaches and 576 people in the back coaches. How many people are on the train?
13. 13.840 + 103 =
14. 14.291 + 525 =
15. 15.870 − 501 =
16. 16.871 − 415 =
17. 17.? − 234 = 677
18. 18.717 − 333 =
19. 19.918 − 235 =
20. 20.677 − ? = 386
21. 21.A train has 329 people in the front coaches and 194 people in the back coaches. How many people are on the train?
22. 22.620 − 255 =
23. 23.305 − 140 =
24. 24.A school has 241 children. 187 of them are girls. How many boys are there?
25. 25.195 + 563 =
26. 26.164 + 833 =
27. 27.738 − 136 =
28. 28.417 − 331 =
29. 29.? − 121 = 212
30. 30.936 − ? = 711
31. 31.644 − ? = 93
32. 32.A school has 830 children. 110 of them are girls. How many boys are there?
33. 33.679 − 352 =
34. 34.A train has 545 people in the front coaches and 307 people in the back coaches. How many people are on the train?
35. 35.? + 399 = 723
36. 36.895 − 502 =
37. 37.717 + ? = 984
38. 38.335 + 560 =
39. 39.A school has 211 children. 133 of them are girls. How many boys are there?
40. 40.A train has 312 people in the front coaches and 342 people in the back coaches. How many people are on the train?

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