The rules for finding the least common denominator are clearly explained at this website. Two different methods are given. This is an excellent place to get step by step explanations for working with fractions.

[Free Registration/Login may be required to access all resource tools.] In this learning module, students must find the least common denominator for the fractions they are presented with. Includes video demonstrating a sample problem...

Find a quick, concise explanation of how to find the least common denominator for fractions or rational expressions. Examples are given and clearly explained.

The concept of common denominators is introduced in this video lesson using like fractions. Students can check their understanding with an assessment.

This is an excellent resource to visually illustrate adding and subtracting fractions by finding the lowest common denominator.

Use Glencoe's Math Course 3 randomly generated self-checking quiz to test your knowledge of adding and subtracting fractions with like denominators. Each question has a "Hint" link to help. Choose the correct answer for each problem. At...

Use Glencoe's randomly generated self-checking quiz to test your knowledge of adding and subtracting fractions with like denominators. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of...

Learners learn how to find a common denominator between two fractions and then add or subtract the fractions. Decomposition is used to identify patterns in fractions that are relatively easy to visualize, and apply these patterns to...

Learn the "easiest method" for finding the common denominator of two fractions with different denominators. View animated examples and look over the steps that it takes to find a common denominator and add two fractions.

[Free Registration/Login may be required to access all resource tools.] Compare fractions using lowest common denominators.

[Free Registration/Login may be required to access all resource tools.] In this lesson students find the sum of fractions with like or common denominators. Students examine guided notes, review guided practice, watch instructional videos...

Solve addition and subtraction word problems involving fractions and mixed numbers. Fractions and mixed numbers have common denominators.

Practice rewriting fractions to have the same denominator. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

[Free Registration/Login may be required to access all resource tools.] Order fractions from least to greatest and greatest to least using lowest common denominators.

Part (a) of this task asks students to find and use two different common denominators to add the given fractions. The purpose of this question is to help students realize that they can use any common denominator to find a solution, not...

Part (a) of this task asks students to use two different denominators to subtract fractions. The purpose of this is to help students realize that any common denominator will work, not just the least common denominator. Part (b) does not...

Add two fractions with the like denominators.

In this exercise, questions provide practice with adding fractions with common denominators. Immediate feedback is given and hints or a video are available if needed.

Solve a subtraction problem with two fractions with like denominators. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

In this exercise, questions provide practice with subtracting fractions with common denominators. Immediate feedback is given and hints or a video are available if needed.

A graphing calculator lesson focusing on common denominator. Lesson contains detailed examples, visual demonstrations with key functions, and practice problems. Acrobat Reader required.

[Free Registration/Login may be required to access all resource tools.] In this learning module, students must find the least common denominator of two fractions in order to subtract one from the other. Includes video demonstrating a...

[Free Registration/Login may be required to access all resource tools.] Find the difference of fractions with like or common denominators.

[Free Registration/Login may be required to access all resource tools.] For this learning module, students must compare fractions where the numerators or the denominators are the same and state which fraction is smaller or larger....