-50% is the change from 910 to 455
Calculation steps:
[( 455 - 910 ) ÷ 910] x 100 = -50%
Formula
Percentage change = [(455 - 910) / 910] x 100
Subtract the new number by the original number
455 - 910 = -455
-455 ÷ 910 = -0.5
-0.5 x 100 = -50%
Example