-91.28% is the change from 642 to 56
Calculation steps:
[( 56 - 642 ) ÷ 642] x 100 = -91.28%
Formula
Percentage change = [(56 - 642) / 642] x 100
Subtract the new number by the original number
56 - 642 = -586
-586 ÷ 642 = -0.9127725856697819
-0.9127725856697819 x 100 = -91.28%