What is $\frac{1}{5}+\frac{1}{5}$15+15?
Find the value of $\frac{1}{2}-\frac{1}{2}$12−12.
Find the value of $\frac{2}{5}-\frac{1}{5}$25−15.
Find the value of $\frac{6}{8}+\frac{1}{8}$68+18.
Understand a fraction a/b with a > 1 as a sum of fractions 1/b.