-46.42% is the change from 642 to 344
Calculation steps:
[( 344 - 642 ) ÷ 642] x 100 = -46.42%
Formula
Percentage change = [(344 - 642) / 642] x 100
Subtract the new number by the original number
344 - 642 = -298
-298 ÷ 642 = -0.46417445482866043
-0.46417445482866043 x 100 = -46.42%