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2/5 - 3/10 = 4/10 - 3/10 = 1/10
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One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.
7/10 - 2/5 = 3/10 or three tenths
It is: 4/5 minus 3/10 = 1/2
3/5
7/10 - 2/5(4/10) = 3/10