Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 832 · 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. 1.611 + 180 =
2. 2.? − 173 = 47
3. 3.467 − 245 =
4. 4.? + 692 = 808
5. 5.A school has 936 children. 519 of them are girls. How many boys are there?
6. 6.649 + 230 =
7. 7.? + 440 = 628
8. 8.A school has 561 children. 321 of them are girls. How many boys are there?
9. 9.493 − 219 =
10. 10.A train has 554 people in the front coaches and 113 people in the back coaches. How many people are on the train?
11. 11.615 − ? = 208
12. 12.? + 251 = 384
13. 13.352 + 429 =
14. 14.? + 830 = 969
15. 15.835 − ? = 580
16. 16.A school has 425 children. 147 of them are girls. How many boys are there?
17. 17.777 − 597 =
18. 18.A school has 781 children. 543 of them are girls. How many boys are there?
19. 19.530 − ? = 79
20. 20.A school has 530 children. 365 of them are girls. How many boys are there?
21. 21.802 + 107 =
22. 22.360 − ? = 255
23. 23.371 + 531 =
24. 24.423 + 521 =
25. 25.443 − 289 =
26. 26.? − 120 = 393
27. 27.375 + 414 =
28. 28.A train has 661 people in the front coaches and 161 people in the back coaches. How many people are on the train?
29. 29.843 − 262 =
30. 30.723 − ? = 545
31. 31.? + 184 = 726
32. 32.350 + 608 =
33. 33.356 + 175 =
34. 34.715 + ? = 948
35. 35.723 − 175 =
36. 36.281 − 142 =
37. 37.590 + ? = 745
38. 38.A train has 428 people in the front coaches and 143 people in the back coaches. How many people are on the train?
39. 39.406 − 288 =
40. 40.274 + 179 =

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