The least five digit number which is exactly divisible by 12,

To find the least five-digit number divisible by 12, we need to follow these steps:

1. Identify the smallest five-digit number. This is 10000.
2. Check if this number is divisible by 12. We do this by dividing 10000 by 12. If the remainder is 0, then the number is divisible by 12. In this case, the remainder is not 0, so 10000 is not divisible by 12.
3. If the number is not divisible by 12, add 1 to the number and check again. So, we check 10001, 10002, 10003, and so on.
4. Repeat this process until we find a number that is divisible by 12.

By following these steps, we find that the least five-digit number which is exactly divisible by 12 is 10008.