Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 734 · 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 510 people in the front coaches and 265 people in the back coaches. How many people are on the train?
2. 2.A train has 207 people in the front coaches and 726 people in the back coaches. How many people are on the train?
3. 3.A school has 539 children. 443 of them are girls. How many boys are there?
4. 4.781 + ? = 888
5. 5.? + 879 = 979
6. 6.472 + ? = 913
7. 7.? − 489 = 490
8. 8.? − 267 = 297
9. 9.A school has 884 children. 463 of them are girls. How many boys are there?
10. 10.526 + 252 =
11. 11.247 − 134 =
12. 12.A school has 688 children. 273 of them are girls. How many boys are there?
13. 13.272 − ? = 35
14. 14.917 − 125 =
15. 15.227 + 207 =
16. 16.? − 146 = 184
17. 17.? + 624 = 959
18. 18.? + 738 = 909
19. 19.620 + 166 =
20. 20.? + 897 = 998
21. 21.610 − ? = 221
22. 22.? + 664 = 899
23. 23.A school has 531 children. 496 of them are girls. How many boys are there?
24. 24.877 − 861 =
25. 25.156 + 345 =
26. 26.424 − 380 =
27. 27.A school has 969 children. 876 of them are girls. How many boys are there?
28. 28.736 + 125 =
29. 29.369 − 196 =
30. 30.621 + 122 =
31. 31.131 + 403 =
32. 32.815 − 641 =
33. 33.130 + ? = 900
34. 34.? − 119 = 878
35. 35.778 + ? = 979
36. 36.A school has 918 children. 751 of them are girls. How many boys are there?
37. 37.303 + 251 =
38. 38.671 + ? = 799
39. 39.? − 306 = 459
40. 40.? + 139 = 300

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