### Home > MC1 > Chapter 7 > Lesson 7.2.5 > Problem7-94

7-94.

Show how finding a Least Common Multiple can help you to simplify each of the following expressions. Then simplify them.

1.  $\frac { 2 } { 3 } - \frac { 5 } { 12 }$

What is the least common multiple of $3$ and $12$? How can this help you with this calculation?

Convert two-thirds to a fraction with a denominator of $12$.

$\left ( \frac{2}{3} \right )\left ( \frac{4}{4} \right )=\frac{8}{12}$

$\frac{8}{12}-\frac{5}{12}=\frac{3}{12}=\frac{1}{4}$
$\frac{1}{4}$
1.  $\frac { 4 } { 5 } + \frac { 11 } { 12 }$