Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 570 · 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.A train has 271 people in the front coaches and 154 people in the back coaches. How many people are on the train?
2. 2.A train has 497 people in the front coaches and 421 people in the back coaches. How many people are on the train?
3. 3.? + 322 = 570
4. 4.897 − ? = 334
5. 5.A train has 528 people in the front coaches and 292 people in the back coaches. How many people are on the train?
6. 6.751 + 232 =
7. 7.764 + 231 =
8. 8.352 + ? = 609
9. 9.247 − 222 =
10. 10.313 − 187 =
11. 11.765 − 137 =
12. 12.A school has 992 children. 795 of them are girls. How many boys are there?
13. 13.719 − ? = 203
14. 14.647 + 137 =
15. 15.965 − 751 =
16. 16.? + 516 = 659
17. 17.? − 582 = 315
18. 18.612 + 171 =
19. 19.853 + 118 =
20. 20.223 + 701 =
21. 21.A train has 769 people in the front coaches and 137 people in the back coaches. How many people are on the train?
22. 22.613 + 162 =
23. 23.338 + ? = 859
24. 24.A school has 967 children. 810 of them are girls. How many boys are there?
25. 25.979 − 793 =
26. 26.154 + 622 =
27. 27.? − 401 = 274
28. 28.681 + 232 =
29. 29.A school has 891 children. 721 of them are girls. How many boys are there?
30. 30.445 − 265 =
31. 31.572 − ? = 8
32. 32.? + 857 = 983
33. 33.142 + 197 =
34. 34.555 − 147 =
35. 35.207 − ? = 17
36. 36.A school has 832 children. 610 of them are girls. How many boys are there?
37. 37.A school has 205 children. 157 of them are girls. How many boys are there?
38. 38.389 + 380 =
39. 39.670 − ? = 93
40. 40.494 + 124 =

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