One way to find a common denominator for two (or more!) fractions is to list the multiples of each denominator until we find the smallest multiple they have in common.

Learn all about finding common denominators in fractions. Watch how to use the least common multiple of the denominators to rewrite fractions, making them easier to compare or add.

Learn how to rewrite fractions with different denominators as equivalent fractions with a common denominator. Watch how to visually represent this process and apply it to solve problems.

The greatest common factor (GCF) of a set of numbers is the largest factor that all the numbers share. For example, 12, 20, and 24 have two common factors: 2 and 4. The largest is 4, so we say that the …

When adding and subtracting fractions, we are required to have a common denominator. If we are initially given fractions with out a common denominator, we find the least common multiple for the …

Learn how to find common denominators for fractions with different numerators and denominators by identifying multiples of the original denominators. It demonstrates the process using 1/4 and 5/6, …

To add or subtract two rational expressions with the same denominator, we simply add or subtract the numerators and write the result over the common denominator.

We have two fractions, 3 4 and 7 6 , and we want to rewrite them so that they have a common denominator (and whole number numerators). What numbers could we use for the denominator?

The greatest common divisor (GCD) and greatest common factor (GCF) are the same thing. To find the GCD/GCF of two numbers, list their factors, identify the common factors, and choose the largest one.

To subtract fractions with different denominators, you need to find a common denominator. This can be done by identifying the least common multiple of the two denominators.