100 is equal to \(10^{2}\), So, when you multiply the scientific notation by 100, you should add 2 to the exponent of 10 in that scientific notation:
For example;
\(9.12* 10^{8} * 100\)
= \(9.12* 10^{8} * 10^{2}\)
= \(9.12* 10^{8+2}\)
= \(9.12* 10^{10}\)
