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
The result is one hundredth of the number before.
100000 - 1 = 99999
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.