Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 122 · 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. 1.694 + ? = 917
2. 2.249 + 248 =
3. 3.358 + 184 =
4. 4.? − 135 = 259
5. 5.A school has 338 children. 301 of them are girls. How many boys are there?
6. 6.A school has 220 children. 100 of them are girls. How many boys are there?
7. 7.A train has 803 people in the front coaches and 137 people in the back coaches. How many people are on the train?
8. 8.A school has 793 children. 136 of them are girls. How many boys are there?
9. 9.224 − 157 =
10. 10.? + 363 = 849
11. 11.875 + 101 =
12. 12.344 − ? = 121
13. 13.773 + 135 =
14. 14.488 + 171 =
15. 15.A school has 720 children. 453 of them are girls. How many boys are there?
16. 16.888 + 105 =
17. 17.A school has 617 children. 140 of them are girls. How many boys are there?
18. 18.488 − 361 =
19. 19.152 + 240 =
20. 20.? + 467 = 981
21. 21.258 − 155 =
22. 22.? + 261 = 883
23. 23.836 + ? = 938
24. 24.314 + ? = 889
25. 25.A train has 119 people in the front coaches and 371 people in the back coaches. How many people are on the train?
26. 26.412 + 372 =
27. 27.721 − 157 =
28. 28.216 − 131 =
29. 29.779 − 601 =
30. 30.? − 125 = 110
31. 31.A school has 315 children. 308 of them are girls. How many boys are there?
32. 32.569 + 412 =
33. 33.731 − 502 =
34. 34.? − 194 = 22
35. 35.472 + ? = 629
36. 36.741 + 163 =
37. 37.A train has 616 people in the front coaches and 100 people in the back coaches. How many people are on the train?
38. 38.? − 304 = 186
39. 39.231 + 224 =
40. 40.? + 768 = 890

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