66 is just fine. You do not need a point after it.
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decimal form for 66 = 66.0
To convert 66% to decimal divide by 100: 66 ÷ 100 = 0.66
To get the decimal form of 66%, you put 66 over 100 66 100 which to make into a decimal you divide both the number by 100 to get 0.66.
66 and two thirds as a decimal = 66.67
66% = 0.66