middle grade 8th
What is a Common Denominator?
We say that two fractions have a common denominator if both fractions have the same denominator. This is important when you add or subtract two fractions. For example if you want to add 3/4 and 1/6 you need first to exprress both fractions with the same denominator. That is you need to find a common denominator.
A denominator that will work is 12 since
= 2/12 + 9/12
How did I know that 12 is a common denominator?