-89.81% is the change from 638 to 65
Calculation steps:
[( 65 - 638 ) ÷ 638] x 100 = -89.81%
Formula
Percentage change = [(65 - 638) / 638] x 100
Subtract the new number by the original number
65 - 638 = -573
-573 ÷ 638 = -0.8981191222570533
-0.8981191222570533 x 100 = -89.81%