18 (eighteen) is an integer and does not need to be "converted to a decimal"
1/8 (one eighth) is a fraction and can be converted into a decimal: 0.125
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take the % sign 2 spaces over. 18% --> .18
1.8
To convert a fraction into a decimal, simply divide its numerator by its denominator. For example to convert 5/8 to a decimal, divide 5 by 8 to get 0.625.
To convert 9% to a decimal divide by 100: 9% ÷ 100 = 0.09
To convert 50% to decimal divide by 100: 50% ÷ 100 = 0.5