Question

85-4÷9×10 has a value of 90 where do i put the parentheses?

Answer 1

You have to put the parentheses like this:

$(85-4) \div 9 \times 10$

In fact, you have to perform the operation inside parentheses first, and then proceed in order:

$81 \div 9 \times 10 = 9 \times 10 = 90$