Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 810 · 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. 1.569 − 165 =
2. 2.225 + 663 =
3. 3.421 + 131 =
4. 4.A school has 728 children. 193 of them are girls. How many boys are there?
5. 5.611 − ? = 110
6. 6.653 − ? = 1
7. 7.? + 859 = 966
8. 8.837 − ? = 679
9. 9.? + 586 = 825
10. 10.716 + 151 =
11. 11.A train has 349 people in the front coaches and 351 people in the back coaches. How many people are on the train?
12. 12.A school has 486 children. 449 of them are girls. How many boys are there?
13. 13.334 − 228 =
14. 14.401 − 251 =
15. 15.803 + 101 =
16. 16.534 + 132 =
17. 17.204 + 429 =
18. 18.? − 255 = 4
19. 19.399 + ? = 578
20. 20.462 − ? = 302
21. 21.476 + 256 =
22. 22.525 − 192 =
23. 23.786 + ? = 937
24. 24.253 + 604 =
25. 25.641 − 199 =
26. 26.794 − 609 =
27. 27.279 + 395 =
28. 28.A train has 621 people in the front coaches and 193 people in the back coaches. How many people are on the train?
29. 29.A train has 795 people in the front coaches and 115 people in the back coaches. How many people are on the train?
30. 30.A school has 423 children. 359 of them are girls. How many boys are there?
31. 31.737 + 153 =
32. 32.? + 246 = 633
33. 33.? − 399 = 146
34. 34.496 + 104 =
35. 35.563 + ? = 968
36. 36.A school has 546 children. 536 of them are girls. How many boys are there?
37. 37.485 + 401 =
38. 38.236 − 161 =
39. 39.660 − 377 =
40. 40.520 − ? = 114

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