When we divide a number by a power of 10, the decimal point changes its position. Specifically, the decimal points will move to the left according to the exponent of the power. For example, let's say we have the following division.
As we said before, we just have to move the decimal point to the left. In this case, we have to move it to 3 spots.
Hence, the division is equivalent to 0.542.
That's how the division works when you divide by a power of 10.