Question

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

Answer 1

`20 1/2`

Explanation:

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

`color(red)(21)color(blue)(-1xx2/4)`

`=color(red)(21)color(blue)(-cancel2/cancel4^2)`

`=color(red)(21)color(blue)(-1/2)`

=`20 1/2`