-33.59% is the change from 256 to 170
Calculation steps:
[( 170 - 256 ) ÷ 256] x 100 = -33.59%
Formula
Percentage change = [(170 - 256) / 256] x 100
Subtract the new number by the original number
170 - 256 = -86
-86 ÷ 256 = -0.3359375
-0.3359375 x 100 = -33.59%