Step 1: Move the decimal point from its current position (the black dot) to a position immediately to the right of the first nonzero digit (the red dot).
0.0001.2
Step 2: We moved the decimal point 4 spaces to the left. Therefore, the exponent on base 10 will be negative 4.Now we know that the:
Mantissa = 1.2
Exponent = -4
So, the solution is:
$$0.00012 = \color{blue}{ 1.2} \cdot 10^{ \color{red}{ -4 }}$$