138.52% is the change from 270 to 644
Calculation steps:
[( 644 - 270 ) ÷ 270] x 100 = 138.52%
Formula
Percentage change = [(644 - 270) / 270] x 100
Subtract the new number by the original number
644 - 270 = 374
374 ÷ 270 = 1.385185185185185
1.385185185185185 x 100 = 138.52%