-60.25% is the change from 644 to 256
Calculation steps:
[( 256 - 644 ) ÷ 644] x 100 = -60.25%
Formula
Percentage change = [(256 - 644) / 644] x 100
Subtract the new number by the original number
256 - 644 = -388
-388 ÷ 644 = -0.6024844720496895
-0.6024844720496895 x 100 = -60.25%