66/1000 = 333/500
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666 over 1000 or .666
66.6% = 666/1000 = 333/500 which cannot be simplified further. However, 66.6% is often an abbreviated form for 66.6 recurrent. In this case, the fraction is 666/999 = 2/3
0.666 = 666/1000 = 333/500
6.66 is equivalent to 666/100
66.6% equates to 66.6/100 = 666/1000 57 x 666/1000 = 37.96 (2dp) 66.6% of 57 is 37.96 NOTE : If the question is, What is 66.6666...% of 57? Then the calculation simplifies to 57 x 2/3 = 38