Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 313 · 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.? − 381 = 584
2. 2.271 − ? = 34
3. 3.A school has 350 children. 122 of them are girls. How many boys are there?
4. 4.620 + 281 =
5. 5.424 − 102 =
6. 6.403 + 129 =
7. 7.727 − ? = 290
8. 8.539 − ? = 213
9. 9.? + 838 = 975
10. 10.829 − 420 =
11. 11.A school has 681 children. 209 of them are girls. How many boys are there?
12. 12.525 + 105 =
13. 13.599 − 249 =
14. 14.? − 200 = 316
15. 15.? − 314 = 675
16. 16.312 − ? = 55
17. 17.A train has 229 people in the front coaches and 728 people in the back coaches. How many people are on the train?
18. 18.? − 239 = 62
19. 19.540 − 436 =
20. 20.503 − 468 =
21. 21.468 − 298 =
22. 22.568 + ? = 745
23. 23.681 − 314 =
24. 24.A train has 456 people in the front coaches and 362 people in the back coaches. How many people are on the train?
25. 25.222 + 617 =
26. 26.756 + 174 =
27. 27.? − 164 = 637
28. 28.337 − 160 =
29. 29.366 − 354 =
30. 30.856 − 667 =
31. 31.293 + 136 =
32. 32.945 − 859 =
33. 33.781 + 134 =
34. 34.A train has 722 people in the front coaches and 189 people in the back coaches. How many people are on the train?
35. 35.? − 207 = 1
36. 36.407 + 161 =
37. 37.664 − ? = 336
38. 38.684 + 128 =
39. 39.103 + 282 =
40. 40.158 + ? = 794

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