Answer:
20
Explanation:
To determine the number of 9s between 1 and 100, we can consider the numbers from 1 to 99 since we want to exclude 100.
In the range from 1 to 99, we can observe the following patterns:
There is one 9 in each of the units' places (9, 19, 29, ..., 89, 99), giving us 10 occurrences.
There is one 9 in each of the tens' places (90, 91, 92, ..., 99), giving us 10 occurrences.
Therefore, there are a total of 10 + 10 = 20 occurrences of the digit 9 between 1 and 100.