# How do you evaluate 21 - 1 xx 2 ÷ 4?

May 14, 2018

$20 \frac{1}{2}$

#### Explanation:

PEMDAS

first we go left to right and do multiplication and division

$1 \times 2 = 2$
2÷4=1/2
then going left to right again and doing all addition and subtraction
$21 - \frac{1}{2} = 20 \frac{1}{2}$