-98.43% is the change from 638 to 10
Calculation steps:
[( 10 - 638 ) ÷ 638] x 100 = -98.43%
Formula
Percentage change = [(10 - 638) / 638] x 100
Subtract the new number by the original number
10 - 638 = -628
-628 ÷ 638 = -0.9843260188087775
-0.9843260188087775 x 100 = -98.43%