# How do you evaluate \frac { 2} { 5} \times \frac { 15} { 21} =?

Oct 6, 2017

$\frac{2}{7}$

#### Explanation:

Start by multiplying across:

$\frac{2}{5} \times \frac{15}{21} = \frac{\left(2\right) \left(15\right)}{\left(5\right) \left(21\right)} = \frac{30}{105}$

Divide the top and bottom by 15 (a giant 1):

$\frac{30 \div 15}{105 \div 15} = \frac{2}{7}$