What is the percent decrease from 90 to 45

A change from 45 to 90 represents a positive change (increase) of 100% Use the formula found below on this webpage to find the percent change by replacing the given values: Percent change = [ (45 - 90) / 45] x 100 = 100 % (increase) Where: 45 is the old value and 90 is the new value. In this case we have a positive change (increase) of 100 percent because the new value is greater than the old value.

50 because 90 divided by 45 is 2 and that it half of it and half is also known as 50%