-57.05% is the change from 638 to 274
Calculation steps:
[( 274 - 638 ) ÷ 638] x 100 = -57.05%
Formula
Percentage change = [(274 - 638) / 638] x 100
Subtract the new number by the original number
274 - 638 = -364
-364 ÷ 638 = -0.5705329153605015
-0.5705329153605015 x 100 = -57.05%