Question

What is the answer to 90-9÷3 I subtracted 90-9=81 then I divided 81÷3 and my answer is 27. Is that correct?

Answer 1

Always do division first so 9 divided by 3 = 3 90 - 3 = 87

Answer 2

If you look at the order of operations, the divide comes before subtracting. 
So you first divide 9 by 3, then subtract that from 90:

90 - 9 / 3 
= 90 - 3
= 87