Question

what is the value of the expression $-\frac{2}{5}-\frac{7}{10}$?
a $-1\frac{1}{10}$
b $- 1$
c $-\frac{3}{5}$
d $\frac{7}{25}$

Explanation:

Step1: Find a common denominator

The common - denominator of 5 and 10 is 10. Rewrite $-\frac{2}{5}$ as $-\frac{2\times2}{5\times2}=-\frac{4}{10}$.

Step2: Subtract the fractions

$-\frac{4}{10}-\frac{7}{10}=\frac{-4 - 7}{10}=\frac{-11}{10}=-1\frac{1}{10}$.

Answer:

A. $-1\frac{1}{10}$