99
99 is the largest composite number before 100.
The last prime number before 100 is 97
97
97
90
9 and 11
101
Yes, it comes after 99 and before 101. It is written out as one hundred and it is typed as 100.
Number 99 is 100 - 1 = IC with 1 before 100 for subtraction
100000 - 1 = 99999
The result is one hundredth of the number before.
The number before 100,000,000,000 is 99,999,999,999. It is one less than 100 billion. In numerical terms, this is achieved by subtracting one from the given number.