-97.66% is the change from 256 to 6
Calculation steps:
[( 6 - 256 ) ÷ 256] x 100 = -97.66%
Formula
Percentage change = [(6 - 256) / 256] x 100
Subtract the new number by the original number
6 - 256 = -250
-250 ÷ 256 = -0.9765625
-0.9765625 x 100 = -97.66%