-50% is the change from 912 to 456
Calculation steps:
[( 456 - 912 ) ÷ 912] x 100 = -50%
Formula
Percentage change = [(456 - 912) / 912] x 100
Subtract the new number by the original number
456 - 912 = -456
-456 ÷ 912 = -0.5
-0.5 x 100 = -50%
Example