# How do you simplify 21 - 1 times 2 ÷ 4 using PEMDAS?

Oct 13, 2016

$20 \frac{1}{2}$

#### Explanation:

There are two separate terms. Keep them separate until the last line.

$\textcolor{red}{21} \textcolor{b l u e}{- 1 \times \frac{2}{4}}$

$= \textcolor{red}{21} \textcolor{b l u e}{- \frac{\cancel{2}}{\cancel{4}} ^ 2}$

$= \textcolor{red}{21} \textcolor{b l u e}{- \frac{1}{2}}$

=$20 \frac{1}{2}$