It would be two fifths turned into tenths which is two tenths - (when you turn fifths into tenths, you multiply it by 2 so you do the same with the numerator.) You do not change the denominator so you subtract the numerators 2-1=1. The answer is one tenth.
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The awnswer is 1 tenth
One half minus one fifth is 3 tenths
One tenth
One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.
1/2 minus 1/5 = 3/10