44.22% is the change from 640 to 923
Calculation steps:
[( 923 - 640 ) ÷ 640] x 100 = 44.22%
Formula
Percentage change = [(923 - 640) / 640] x 100
Subtract the new number by the original number
923 - 640 = 283
283 ÷ 640 = 0.4421875
0.4421875 x 100 = 44.22%
Example