Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 619 · 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.? + 603 = 855
2. 2.150 + 392 =
3. 3.759 + ? = 945
4. 4.908 − 851 =
5. 5.A school has 620 children. 481 of them are girls. How many boys are there?
6. 6.407 + 129 =
7. 7.A train has 245 people in the front coaches and 247 people in the back coaches. How many people are on the train?
8. 8.A train has 472 people in the front coaches and 479 people in the back coaches. How many people are on the train?
9. 9.? + 409 = 779
10. 10.446 − ? = 173
11. 11.A school has 681 children. 190 of them are girls. How many boys are there?
12. 12.A train has 145 people in the front coaches and 146 people in the back coaches. How many people are on the train?
13. 13.797 − ? = 564
14. 14.A train has 167 people in the front coaches and 197 people in the back coaches. How many people are on the train?
15. 15.596 − ? = 377
16. 16.197 + ? = 660
17. 17.438 + 305 =
18. 18.493 + 284 =
19. 19.530 + 178 =
20. 20.208 + ? = 887
21. 21.354 + 460 =
22. 22.323 − 150 =
23. 23.A school has 316 children. 144 of them are girls. How many boys are there?
24. 24.720 − 166 =
25. 25.770 − ? = 429
26. 26.A train has 899 people in the front coaches and 100 people in the back coaches. How many people are on the train?
27. 27.363 + ? = 582
28. 28.A school has 634 children. 363 of them are girls. How many boys are there?
29. 29.A train has 371 people in the front coaches and 253 people in the back coaches. How many people are on the train?
30. 30.416 + ? = 941
31. 31.A train has 260 people in the front coaches and 582 people in the back coaches. How many people are on the train?
32. 32.614 − 290 =
33. 33.? + 232 = 810
34. 34.457 + 506 =
35. 35.A train has 211 people in the front coaches and 780 people in the back coaches. How many people are on the train?
36. 36.A school has 417 children. 224 of them are girls. How many boys are there?
37. 37.A train has 165 people in the front coaches and 826 people in the back coaches. How many people are on the train?
38. 38.379 − ? = 215
39. 39.480 + 262 =
40. 40.430 − 404 =

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