64500% is the change from 1 to 646
Calculation steps:
[( 646 - 1 ) ÷ 1] x 100 = 64500%
Formula
Percentage change = [(646 - 1) / 1] x 100
Subtract the new number by the original number
646 - 1 = 645
645 ÷ 1 = 645
645 x 100 = 64500%
Example