### Instruction: How many three-digit numbers are divisible by 13?### Response: To find how many three-digit numbers are divisible by 13, I need to find the first and the last three-digit multiples of 13.
The smallest three-digit number is 100, and the largest is 999.
To find the first multiple of 13 that is greater than or equal to 100, I can divide 100 by 13 and round up to the nearest integer.
This gives me 8, and multiplying 8 by 13, I get 104.
So 104 is the first three-digit multiple of 13.
To find the last multiple of 13 that is less than or equal to 999, I can divide 999 by 13 and round down to the nearest integer.
This gives me 76, and multiplying 76 by 13, I get 988.
So 988 is the last three-digit multiple of 13.
Now I can use a formula to find how many multiples of 13 are between 104 and 988, inclusive.
The formula is (last multiple - first multiple) / 13 + 1.
Plugging in the values, I get (988 - 104) / 13 + 1 = 884 / 13 + 1 = 68 + 1 = 69.
So there are 69 three-digit numbers that are divisible by 13.