-82.42% is the change from 256 to 45
Calculation steps:
[( 45 - 256 ) ÷ 256] x 100 = -82.42%
Formula
Percentage change = [(45 - 256) / 256] x 100
Subtract the new number by the original number
45 - 256 = -211
-211 ÷ 256 = -0.82421875
-0.82421875 x 100 = -82.42%