Answer :
We have to estimate
[tex]\frac{4}{5}-\frac{1}{2}[/tex]Let's use the LCM of 5 and 2, i.e 10 as a common denominator, we have;
[tex]\begin{gathered} \frac{4(2)-1(5)}{10} \\ =\frac{8-5}{10} \\ =\frac{3}{10} \end{gathered}[/tex]Thus the correct answer is 3/10