There are two main ways to convert a percent to a decimal:
Method 1: Dividing by 100 (most common method)

Take the percentage value.

Divide it by 100.

You can divide by moving the decimal two places to the left (ignoring any trailing zeros).
Example: Convert 50% to a decimal.

Divide 50 by 100: 50 / 100 = 0.5

Alternatively, move the decimal in 50 two places to the left: 50.00 > 0.50 (ignore the trailing zeros)
Method 2: Multiply by 0.01 (alternative method)

Take the percentage value.

Multiply it by 0.01 (which is the same as dividing by 100).
Example: Convert 75% to a decimal.

Multiply 75 by 0.01: 75 x 0.01 = 0.75
Both methods will give you the same decimal equivalent of the percentage. The first method (dividing by 100) is generally faster and more common.