Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 550 · 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. 1.890 + 107 =
2. 2.638 + 279 =
3. 3.428 + 267 =
4. 4.292 + 445 =
5. 5.576 + 129 =
6. 6.354 − 325 =
7. 7.303 + ? = 798
8. 8.? + 541 = 938
9. 9.328 − ? = 86
10. 10.784 + 199 =
11. 11.264 + 205 =
12. 12.690 + ? = 821
13. 13.A train has 124 people in the front coaches and 468 people in the back coaches. How many people are on the train?
14. 14.? − 450 = 212
15. 15.A train has 560 people in the front coaches and 122 people in the back coaches. How many people are on the train?
16. 16.715 − ? = 251
17. 17.A school has 202 children. 125 of them are girls. How many boys are there?
18. 18.A train has 658 people in the front coaches and 161 people in the back coaches. How many people are on the train?
19. 19.A school has 508 children. 291 of them are girls. How many boys are there?
20. 20.? − 117 = 175
21. 21.149 + 291 =
22. 22.415 + ? = 979
23. 23.534 + ? = 867
24. 24.364 + 450 =
25. 25.266 + ? = 424
26. 26.A school has 736 children. 259 of them are girls. How many boys are there?
27. 27.? − 246 = 264
28. 28.671 − 117 =
29. 29.880 + ? = 988
30. 30.530 − ? = 119
31. 31.? + 895 = 996
32. 32.876 + 119 =
33. 33.875 + 108 =
34. 34.461 + 115 =
35. 35.307 − 180 =
36. 36.A train has 161 people in the front coaches and 789 people in the back coaches. How many people are on the train?
37. 37.854 + ? = 984
38. 38.A train has 295 people in the front coaches and 602 people in the back coaches. How many people are on the train?
39. 39.658 + 166 =
40. 40.218 + ? = 979

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