-45.16% is the change from 640 to 351
Calculation steps:
[( 351 - 640 ) ÷ 640] x 100 = -45.16%
Formula
Percentage change = [(351 - 640) / 640] x 100
Subtract the new number by the original number
351 - 640 = -289
-289 ÷ 640 = -0.4515625
-0.4515625 x 100 = -45.16%