4.Find ten rational numbers between $$\frac { -2 }{ 5 }$$ and $$\frac { 1 }{ 2 }$$.
We have rational numbers as $$\frac{-2}{5}$$ and $$\frac{1}{2}$$
⇒ $$\frac{-2}5 =\frac{-2×4}{5×4}=\frac{-8}{20}$$
and $$\frac{1}2 =\frac{1×10}{2×10}=\frac{10}{20}$$
Now, we have to find ten rational numbers between $$\frac{-8}{20}$$ and$$\frac{10}{20}$$
So,these rational numbers can be $$\frac{-7}{20},\frac{-6}{20},\frac{-5}{20},\frac{-4}{20},\frac{-3}{20},\frac{-2}{20},\frac{-1}{20},0,\frac{1}{20},\frac{2}{20}$$