Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 511 · 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. 1.817 + 140 =
2. 2.180 + 201 =
3. 3.A school has 651 children. 585 of them are girls. How many boys are there?
4. 4.A school has 897 children. 453 of them are girls. How many boys are there?
5. 5.? + 338 = 924
6. 6.245 − 197 =
7. 7.261 + 120 =
8. 8.991 − 254 =
9. 9.A school has 349 children. 128 of them are girls. How many boys are there?
10. 10.A school has 769 children. 289 of them are girls. How many boys are there?
11. 11.473 + 108 =
12. 12.496 + 430 =
13. 13.A train has 280 people in the front coaches and 676 people in the back coaches. How many people are on the train?
14. 14.A train has 192 people in the front coaches and 415 people in the back coaches. How many people are on the train?
15. 15.817 − 606 =
16. 16.? + 637 = 963
17. 17.? + 155 = 271
18. 18.A school has 245 children. 158 of them are girls. How many boys are there?
19. 19.242 + ? = 468
20. 20.? − 539 = 91
21. 21.? + 611 = 777
22. 22.153 + 587 =
23. 23.? − 148 = 111
24. 24.? − 309 = 124
25. 25.A train has 801 people in the front coaches and 191 people in the back coaches. How many people are on the train?
26. 26.318 − ? = 102
27. 27.440 + 176 =
28. 28.424 + ? = 830
29. 29.A train has 202 people in the front coaches and 419 people in the back coaches. How many people are on the train?
30. 30.? + 623 = 914
31. 31.689 + 146 =
32. 32.889 + 105 =
33. 33.718 − 125 =
34. 34.463 − 368 =
35. 35.575 − 401 =
36. 36.725 + 251 =
37. 37.697 + 234 =
38. 38.494 − 129 =
39. 39.586 − 133 =
40. 40.247 − 236 =

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