Question

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

Answer 1

`20 1/2`

Explanation:

PEMDAS

first we go left to right and do multiplication and division

`1xx2=2`
`2÷4=1/2`
then going left to right again and doing all addition and subtraction
`21-1/2=20 1/2`