40% = 0.4
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decimal .4 percent 40%
40% = 0.40
To convert 40% (or any percent) to a decimal divide by 100: 40% ÷ 100 = 0.4
To write 15.5 percent as a decimal, you divide the percent value by 100. So, 15.5 percent as a decimal is 0.155.
40%= .4 or .40