-64.06% is the change from 64 to 23
Calculation steps:
[( 23 - 64 ) ÷ 64] x 100 = -64.06%
Formula
Percentage change = [(23 - 64) / 64] x 100
Subtract the new number by the original number
23 - 64 = -41
-41 ÷ 64 = -0.640625
-0.640625 x 100 = -64.06%
Example