Subtracting one fifth from one gives 1 - 1/5 = 4/5, or four fifths.
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One half minus one fifth is 3 tenths
One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.
1/2 minus 1/5 = 3/10
1/4 minus 1/5 is 1/20.
0.55