9/10 - 2/5 = 9/10 = 4/10 = 5/10 or, in simplest terms, 1/2.
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Thirteen tenths
One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.
one tenths
Two and two fifths. Five minus two and three fifths = two and two fifths
7/10 - 2/5(4/10) = 3/10