6.66 is a decimal
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2/3, if decimal, .666 repeating
.666 66 and 2/3%
They are 6/10, 66/110 and 666/1110.
14 666/1000. Just add as many zeros in the denominator (in this case 3) as there are digits after the decimal point.
It is: 666 = DCLXVI which means 600+60+6 = 666