Step 1: Since 2456 do not have a decimal point, we will add one at the end of the number 2456.
2456.
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).
2.456.
Step 3: We moved the decimal point 3 spaces to the right. Therefore, the exponent on base 10 will be positive 3.Now we know that the:
Mantissa = 2.456
Exponent = 3
So, the solution is:
$$2456 = \color{blue}{ 2.456} \cdot 10^{ \color{red}{ 3 }}$$