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

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Answer 1 · 2018-05-14T19:40:54

$20 1/2$

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
$21-1/2=20 1/2$

How do you evaluate 21 - 1 xx 2 ÷ 421 - 1 xx 2 ÷ 4?