Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 90 · 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 school has 822 children. 115 of them are girls. How many boys are there?
2. 2.? + 296 = 558
3. 3.770 − ? = 422
4. 4.896 − ? = 563
5. 5.157 + 117 =
6. 6.180 + 402 =
7. 7.211 − ? = 73
8. 8.371 + ? = 886
9. 9.? − 214 = 77
10. 10.A school has 545 children. 136 of them are girls. How many boys are there?
11. 11.890 − 758 =
12. 12.A train has 191 people in the front coaches and 280 people in the back coaches. How many people are on the train?
13. 13.786 − 479 =
14. 14.A train has 873 people in the front coaches and 107 people in the back coaches. How many people are on the train?
15. 15.767 + 136 =
16. 16.? − 601 = 62
17. 17.546 + 273 =
18. 18.422 + ? = 873
19. 19.339 + ? = 688
20. 20.A school has 957 children. 333 of them are girls. How many boys are there?
21. 21.495 + 435 =
22. 22.653 − 419 =
23. 23.703 − 251 =
24. 24.A school has 465 children. 306 of them are girls. How many boys are there?
25. 25.483 + 311 =
26. 26.338 − 209 =
27. 27.A school has 383 children. 283 of them are girls. How many boys are there?
28. 28.A school has 972 children. 236 of them are girls. How many boys are there?
29. 29.854 + ? = 956
30. 30.? + 851 = 982
31. 31.643 + ? = 815
32. 32.? + 355 = 913
33. 33.351 − 138 =
34. 34.990 − 209 =
35. 35.? − 237 = 115
36. 36.411 + ? = 993
37. 37.232 + 563 =
38. 38.252 + ? = 736
39. 39.603 + 161 =
40. 40.314 − 165 =

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