-28.53% is the change from 638 to 456
Calculation steps:
[( 456 - 638 ) ÷ 638] x 100 = -28.53%
Formula
Percentage change = [(456 - 638) / 638] x 100
Subtract the new number by the original number
456 - 638 = -182
-182 ÷ 638 = -0.2852664576802508
-0.2852664576802508 x 100 = -28.53%