-51.05% is the change from 523 to 256
Calculation steps:
[( 256 - 523 ) ÷ 523] x 100 = -51.05%
Formula
Percentage change = [(256 - 523) / 523] x 100
Subtract the new number by the original number
256 - 523 = -267
-267 ÷ 523 = -0.5105162523900574
-0.5105162523900574 x 100 = -51.05%