Question

Writing unit fractions with a common denominator to add or subtract

Answer 1

$\frac{1}{2}-\frac{1}{10}$

We must write both fractions in a common denominator.

Since 10/2 = 5, we can multiply the numerator and the denominator of the first fraction by 5 have both fractions with the same denominator:

$\frac{5}{10}-\frac{1}{10}=\frac{4}{10}=\frac{2}{5}$