Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 164 · 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. 1.518 − ? = 133
2. 2.338 − 331 =
3. 3.636 − 177 =
4. 4.566 + 123 =
5. 5.231 + ? = 603
6. 6.A train has 308 people in the front coaches and 408 people in the back coaches. How many people are on the train?
7. 7.A school has 455 children. 235 of them are girls. How many boys are there?
8. 8.492 + ? = 647
9. 9.786 − ? = 38
10. 10.? + 763 = 984
11. 11.? − 343 = 25
12. 12.? + 364 = 777
13. 13.672 − 152 =
14. 14.? + 449 = 867
15. 15.418 + 279 =
16. 16.639 + 150 =
17. 17.148 + ? = 292
18. 18.120 + 145 =
19. 19.251 + 391 =
20. 20.789 + 158 =
21. 21.841 + 151 =
22. 22.723 − 202 =
23. 23.241 + 216 =
24. 24.A train has 383 people in the front coaches and 116 people in the back coaches. How many people are on the train?
25. 25.A train has 371 people in the front coaches and 538 people in the back coaches. How many people are on the train?
26. 26.245 − 110 =
27. 27.245 + 339 =
28. 28.A school has 980 children. 780 of them are girls. How many boys are there?
29. 29.? + 358 = 644
30. 30.342 − 332 =
31. 31.250 − ? = 19
32. 32.A train has 562 people in the front coaches and 146 people in the back coaches. How many people are on the train?
33. 33.634 + 221 =
34. 34.? − 550 = 102
35. 35.453 + 280 =
36. 36.863 − 537 =
37. 37.985 − 968 =
38. 38.A school has 200 children. 137 of them are girls. How many boys are there?
39. 39.A school has 932 children. 567 of them are girls. How many boys are there?
40. 40.692 + 129 =

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