I would not bother with Imperial measures, but if you must, you could write it as 6' 6.5".
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No, 33 is half of 66
66½ºN is the Arctic Circle; 66½ºS is the Antarctic Circle.
66/100=33/50
Six point six.
To write 66% as a decimal, just divide it by 100% or just remove the % sign a nd move the decimal poi nt 2 places to the left. 66% = 66%/100% = 0.66