-47.06% is the change from 646 to 342
Calculation steps:
[( 342 - 646 ) ÷ 646] x 100 = -47.06%
Formula
Percentage change = [(342 - 646) / 646] x 100
Subtract the new number by the original number
342 - 646 = -304
-304 ÷ 646 = -0.47058823529411764
-0.47058823529411764 x 100 = -47.06%