Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 910 · 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. 1.703 + 247 =
2. 2.475 + 135 =
3. 3.599 − ? = 123
4. 4.422 − 100 =
5. 5.399 + 182 =
6. 6.405 + ? = 604
7. 7.A school has 896 children. 110 of them are girls. How many boys are there?
8. 8.? + 594 = 878
9. 9.? − 202 = 658
10. 10.679 − 407 =
11. 11.874 + 103 =
12. 12.712 + ? = 825
13. 13.767 + 190 =
14. 14.A school has 300 children. 108 of them are girls. How many boys are there?
15. 15.A school has 254 children. 244 of them are girls. How many boys are there?
16. 16.680 − 199 =
17. 17.? + 488 = 849
18. 18.569 − 562 =
19. 19.A school has 394 children. 119 of them are girls. How many boys are there?
20. 20.603 − 140 =
21. 21.118 + ? = 924
22. 22.A school has 762 children. 423 of them are girls. How many boys are there?
23. 23.724 + 183 =
24. 24.? − 316 = 283
25. 25.202 − 160 =
26. 26.A school has 443 children. 218 of them are girls. How many boys are there?
27. 27.414 − ? = 101
28. 28.A school has 852 children. 642 of them are girls. How many boys are there?
29. 29.? − 258 = 235
30. 30.A school has 335 children. 241 of them are girls. How many boys are there?
31. 31.? − 619 = 265
32. 32.? + 332 = 939
33. 33.? + 554 = 996
34. 34.427 − 243 =
35. 35.A school has 461 children. 322 of them are girls. How many boys are there?
36. 36.847 − 825 =
37. 37.249 + 245 =
38. 38.? − 609 = 356
39. 39.831 + 148 =
40. 40.359 + 238 =

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