Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 10 · 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. 1.516 − 180 =
2. 2.843 − 351 =
3. 3.635 + ? = 972
4. 4.181 + 789 =
5. 5.421 − 387 =
6. 6.785 − 216 =
7. 7.? + 785 = 967
8. 8.A school has 589 children. 161 of them are girls. How many boys are there?
9. 9.990 − 976 =
10. 10.? + 676 = 976
11. 11.704 − ? = 420
12. 12.? + 535 = 983
13. 13.211 + 565 =
14. 14.835 − ? = 198
15. 15.262 − 125 =
16. 16.203 + ? = 924
17. 17.? + 622 = 884
18. 18.? − 708 = 12
19. 19.? + 451 = 847
20. 20.? − 219 = 645
21. 21.? − 173 = 72
22. 22.988 − 957 =
23. 23.804 + 113 =
24. 24.731 + 118 =
25. 25.A train has 732 people in the front coaches and 228 people in the back coaches. How many people are on the train?
26. 26.A school has 860 children. 834 of them are girls. How many boys are there?
27. 27.A train has 779 people in the front coaches and 204 people in the back coaches. How many people are on the train?
28. 28.A school has 989 children. 276 of them are girls. How many boys are there?
29. 29.777 − 679 =
30. 30.889 + ? = 997
31. 31.A train has 821 people in the front coaches and 143 people in the back coaches. How many people are on the train?
32. 32.805 − 459 =
33. 33.A school has 240 children. 224 of them are girls. How many boys are there?
34. 34.352 + 602 =
35. 35.244 + 681 =
36. 36.561 − 348 =
37. 37.765 − ? = 460
38. 38.A train has 598 people in the front coaches and 146 people in the back coaches. How many people are on the train?
39. 39.A school has 939 children. 248 of them are girls. How many boys are there?
40. 40.756 − 260 =

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