Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 398 · 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. 1.581 + ? = 712
2. 2.? − 203 = 507
3. 3.558 − 209 =
4. 4.465 + ? = 675
5. 5.? + 751 = 881
6. 6.A train has 754 people in the front coaches and 212 people in the back coaches. How many people are on the train?
7. 7.192 + 436 =
8. 8.597 + 393 =
9. 9.? − 459 = 196
10. 10.? + 482 = 796
11. 11.110 + ? = 674
12. 12.785 + 144 =
13. 13.343 − 161 =
14. 14.A school has 791 children. 211 of them are girls. How many boys are there?
15. 15.? + 578 = 765
16. 16.840 + 127 =
17. 17.900 − 223 =
18. 18.871 + ? = 971
19. 19.A school has 220 children. 149 of them are girls. How many boys are there?
20. 20.A train has 805 people in the front coaches and 137 people in the back coaches. How many people are on the train?
21. 21.A train has 405 people in the front coaches and 475 people in the back coaches. How many people are on the train?
22. 22.949 − 483 =
23. 23.355 − 318 =
24. 24.192 + 251 =
25. 25.? − 410 = 340
26. 26.? − 108 = 123
27. 27.A train has 435 people in the front coaches and 486 people in the back coaches. How many people are on the train?
28. 28.581 + 102 =
29. 29.519 − 439 =
30. 30.680 + ? = 993
31. 31.A school has 282 children. 261 of them are girls. How many boys are there?
32. 32.650 + 339 =
33. 33.234 − ? = 103
34. 34.537 + 459 =
35. 35.370 + ? = 802
36. 36.? + 505 = 828
37. 37.987 − 489 =
38. 38.305 − 255 =
39. 39.457 + 429 =
40. 40.749 − ? = 194

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