Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 647 · 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. 1.241 − 231 =
2. 2.182 + 779 =
3. 3.279 − 130 =
4. 4.979 − 613 =
5. 5.703 − 666 =
6. 6.650 − ? = 122
7. 7.907 − 437 =
8. 8.719 − 705 =
9. 9.A school has 301 children. 162 of them are girls. How many boys are there?
10. 10.718 − 181 =
11. 11.228 + 567 =
12. 12.208 − ? = 68
13. 13.A train has 352 people in the front coaches and 458 people in the back coaches. How many people are on the train?
14. 14.603 + 231 =
15. 15.A train has 829 people in the front coaches and 161 people in the back coaches. How many people are on the train?
16. 16.840 + ? = 951
17. 17.690 − 248 =
18. 18.109 + ? = 961
19. 19.? − 366 = 280
20. 20.959 − 815 =
21. 21.308 − 192 =
22. 22.214 − 135 =
23. 23.? + 391 = 562
24. 24.A school has 980 children. 404 of them are girls. How many boys are there?
25. 25.A school has 897 children. 108 of them are girls. How many boys are there?
26. 26.789 − 608 =
27. 27.770 − 532 =
28. 28.465 + ? = 634
29. 29.858 + 106 =
30. 30.575 − ? = 384
31. 31.735 − 219 =
32. 32.150 + 734 =
33. 33.420 + 547 =
34. 34.718 + 160 =
35. 35.431 − 120 =
36. 36.209 − 111 =
37. 37.455 − 300 =
38. 38.342 + ? = 485
39. 39.214 − 194 =
40. 40.? + 193 = 607

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