Question

Find the common denominator 5/10 and 2/5

Answer 1

Exact form 1/5 decimal from 0.06666

Answer 2

Rewrite input as fractions:
5/10, 2/5

For the denominators (10, 5) the least common multiple is 10.

The least common denominator least common multiple is 10.

Rewrite the original inputs as equivalent fractions with the least common multiple: 5/10, 4/10

Your answer for your question is 10.