What is 2.5 as a fraction in the lowest form?

Converting 2.5 into a fraction, we get

$2.5=\frac{25}{10}$

Reducing the fraction to the lowest form, we get

$\frac{25}{10}=\frac{25÷5}{10÷5}=\frac{5}{2}$

Hence, $2.5=\frac{5}{2}$