Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 598 · 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.A train has 119 people in the front coaches and 398 people in the back coaches. How many people are on the train?
2. 2.A train has 801 people in the front coaches and 126 people in the back coaches. How many people are on the train?
3. 3.? + 808 = 921
4. 4.371 + 472 =
5. 5.A school has 611 children. 140 of them are girls. How many boys are there?
6. 6.457 + 260 =
7. 7.? − 429 = 107
8. 8.852 − ? = 657
9. 9.175 + ? = 874
10. 10.642 + 218 =
11. 11.A school has 995 children. 351 of them are girls. How many boys are there?
12. 12.A school has 200 children. 113 of them are girls. How many boys are there?
13. 13.A school has 776 children. 678 of them are girls. How many boys are there?
14. 14.247 + 579 =
15. 15.112 + 842 =
16. 16.? − 556 = 62
17. 17.548 − ? = 77
18. 18.282 + 217 =
19. 19.? − 251 = 57
20. 20.860 + 128 =
21. 21.642 + 125 =
22. 22.191 + 568 =
23. 23.761 − ? = 82
24. 24.725 − 584 =
25. 25.463 − 426 =
26. 26.957 − ? = 600
27. 27.315 + 382 =
28. 28.753 + 240 =
29. 29.261 − ? = 150
30. 30.257 + 558 =
31. 31.A train has 103 people in the front coaches and 502 people in the back coaches. How many people are on the train?
32. 32.A train has 134 people in the front coaches and 614 people in the back coaches. How many people are on the train?
33. 33.327 − ? = 222
34. 34.A school has 359 children. 334 of them are girls. How many boys are there?
35. 35.173 + 554 =
36. 36.464 + 127 =
37. 37.? + 308 = 943
38. 38.808 + 125 =
39. 39.468 − ? = 347
40. 40.126 + 740 =

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