27/30 - 2/30 = 25/30 = 5/6
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Expressed as a proper fraction in its simplest form, 9/10 - 5/6 = 1/15 or one fifteenth.
9/10 - 1/5 = 7/10
One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.
1/3
two tenths or, simplified, one fifth.