Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 819 · 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. 1.275 − 228 =
2. 2.104 + 104 =
3. 3.? + 751 = 862
4. 4.544 + 139 =
5. 5.116 + 746 =
6. 6.A school has 736 children. 384 of them are girls. How many boys are there?
7. 7.218 + 100 =
8. 8.233 − 131 =
9. 9.A train has 706 people in the front coaches and 202 people in the back coaches. How many people are on the train?
10. 10.? − 175 = 675
11. 11.? − 102 = 329
12. 12.? + 707 = 965
13. 13.698 + 103 =
14. 14.? + 794 = 911
15. 15.282 + 486 =
16. 16.170 + 198 =
17. 17.A train has 362 people in the front coaches and 350 people in the back coaches. How many people are on the train?
18. 18.? − 186 = 198
19. 19.A train has 360 people in the front coaches and 362 people in the back coaches. How many people are on the train?
20. 20.551 + 143 =
21. 21.? + 689 = 970
22. 22.A train has 160 people in the front coaches and 812 people in the back coaches. How many people are on the train?
23. 23.447 − 158 =
24. 24.281 − 244 =
25. 25.609 + ? = 902
26. 26.A train has 228 people in the front coaches and 626 people in the back coaches. How many people are on the train?
27. 27.? − 155 = 135
28. 28.851 − 516 =
29. 29.797 + ? = 938
30. 30.737 − ? = 622
31. 31.? + 869 = 992
32. 32.246 + 231 =
33. 33.475 − ? = 48
34. 34.495 − 483 =
35. 35.240 − 227 =
36. 36.656 + 261 =
37. 37.? + 842 = 975
38. 38.331 + ? = 575
39. 39.251 − 120 =
40. 40.399 + ? = 852

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