Step 1: Since 804 do not have a decimal point, we will add one at the end of the number 804.
804.
Step 2: 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).
8.04.
Step 3: We moved the decimal point 2 spaces to the right. Therefore, the exponent on base 10 will be positive 2.Now we know that the:
Mantissa = 8.04
Exponent = 2
So, the solution is:
$$804 = \color{blue}{ 8.04} \cdot 10^{ \color{red}{ 2 }}$$