-46.26% is the change from 642 to 345
Calculation steps:
[( 345 - 642 ) ÷ 642] x 100 = -46.26%
Formula
Percentage change = [(345 - 642) / 642] x 100
Subtract the new number by the original number
345 - 642 = -297
-297 ÷ 642 = -0.46261682242990654
-0.46261682242990654 x 100 = -46.26%