-30.63% is the change from 640 to 444
Calculation steps:
[( 444 - 640 ) ÷ 640] x 100 = -30.63%
Formula
Percentage change = [(444 - 640) / 640] x 100
Subtract the new number by the original number
444 - 640 = -196
-196 ÷ 640 = -0.30625
-0.30625 x 100 = -30.63%