Question

subtract.
$\frac{9}{10}-\frac{-9}{10}=$

Explanation:

Step1: Use rule of subtracting fractions

$\frac{9}{10}-\frac{- 9}{10}=\frac{9-(-9)}{10}$

Step2: Simplify the numerator

Since $9-(-9)=9 + 9=18$, the fraction becomes $\frac{18}{10}$

Step3: Simplify the fraction

$\frac{18}{10}=\frac{9}{5}=1\frac{4}{5}$

Answer:

$\frac{9}{5}$ or $1\frac{4}{5}$