Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 350 · 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. 1.430 − ? = 140
2. 2.321 + 389 =
3. 3.A school has 680 children. 136 of them are girls. How many boys are there?
4. 4.A train has 583 people in the front coaches and 280 people in the back coaches. How many people are on the train?
5. 5.305 − 267 =
6. 6.? + 293 = 403
7. 7.A school has 818 children. 144 of them are girls. How many boys are there?
8. 8.726 + ? = 879
9. 9.292 − 192 =
10. 10.A school has 909 children. 309 of them are girls. How many boys are there?
11. 11.898 − ? = 62
12. 12.894 − 785 =
13. 13.290 + ? = 424
14. 14.552 + 203 =
15. 15.684 − ? = 137
16. 16.574 − 132 =
17. 17.851 + ? = 970
18. 18.? − 760 = 99
19. 19.593 − ? = 430
20. 20.? − 141 = 79
21. 21.? + 507 = 712
22. 22.A train has 131 people in the front coaches and 236 people in the back coaches. How many people are on the train?
23. 23.A school has 841 children. 743 of them are girls. How many boys are there?
24. 24.940 − 130 =
25. 25.A train has 833 people in the front coaches and 107 people in the back coaches. How many people are on the train?
26. 26.? + 156 = 469
27. 27.409 − ? = 30
28. 28.772 − 761 =
29. 29.461 − ? = 352
30. 30.399 + ? = 513
31. 31.A school has 669 children. 137 of them are girls. How many boys are there?
32. 32.948 − 190 =
33. 33.A school has 449 children. 396 of them are girls. How many boys are there?
34. 34.? − 572 = 70
35. 35.327 − 161 =
36. 36.343 − 108 =
37. 37.440 − 169 =
38. 38.974 − 451 =
39. 39.461 + 168 =
40. 40.399 + ? = 684

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