# How do you evaluate  - \frac { 4} { 5} - ( - \frac { 7} { 10} )?

Mar 10, 2018

$- \frac{1}{10}$

#### Explanation:

Find a common denominator, which is 10 in this case

$\frac{10}{5}$ = 2 (Multiply the numerator 4 by 2 to get your new fraction, which is $\frac{4 \cdot 2}{10}$)

$- \frac{8}{10}$ $-$ ($- \frac{7}{10}$) ($- \frac{7}{10}$ becomes positive, because subtracting a negative number give you a positive)

$- \frac{8}{10}$ +$\frac{7}{10}$

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