No, You only need a common denominator when adding or subtracting fractions.
You DO need a common denominator to add, subtract, or compare fractions. You DO NOT need a common denominator to multiply or divide fractions.
You don't need a common denominator to divide fractions.
You don't need a common denominator to divide fractions.
You need at least two numbers to find a common denominator.
You need at least two numbers to find something in common. 90 can be a common denominator of other numbers, but it can't have a common denominator all by itself.
You need at least two fractions to calculate a common denominator.
No only when adding or subtracting fractions a common denominator is needed
You need at least two fractions to find a common denominator.
We will need a value for the denominator to answer that.
Yes.
No.