-31.46% is the change from 642 to 440
Calculation steps:
[( 440 - 642 ) ÷ 642] x 100 = -31.46%
Formula
Percentage change = [(440 - 642) / 642] x 100
Subtract the new number by the original number
440 - 642 = -202
-202 ÷ 642 = -0.3146417445482866
-0.3146417445482866 x 100 = -31.46%