Other
Help With Fractions: Least Common Denominator
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.
Quia
Ixl Learning: Least Common Denominator
Brush up on your math skills relating to the least common denominator then try some practice problems to test your understanding.
CK-12 Foundation
Ck 12: Elem Math: Finding the Least Common Denominator
[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...
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Least Common Denominator
Find a quick, concise explanation of how to find the least common denominator for fractions or rational expressions. Examples are given and clearly explained.
Calculator Soup
Calculator Soup: Lcd Calculator Least Common Denominator
Use this Least Common Denominator Calculator to find the lowest common denominator (LCD) of fractions, integers and mixed numbers. Finding the LCD is important because fractions need to have the same denominator when you are doing...
Quia
Ixl Learning: Least Common Multiple
Brush up on your math skills relating to the least common multiple then try some practice problems to test your understanding.
CK-12 Foundation
Ck 12: Elem Math: Comparing Fractions Using Lcm Word Problems
[Free Registration/Login may be required to access all resource tools.] For this learning module, students are asked to compare fractions in word problems and determine which is bigger or smaller. Includes video demonstrating a sample...
Sophia Learning
Sophia: Comparing Fractions With Unlike Denominators
Students watch a video lesson about comparing fractions with unlike denominators. The tutorial includes an example using common denominators.
Sophia Learning
Sophia: Comparing Fractions With Unlike Denominators
Students review how to compare fractions with unlike denominators. The video tutorial includes detailed examples.
Other
Active Maths Limited: Adding & Subtracting Fractions: Whiteboard Resources
This is an excellent resource to visually illustrate adding and subtracting fractions by finding the lowest common denominator.
Math Is Fun
Math Is Fun: Least Common Denominator
The learning activity examines the least common denominator. Topics include fractions with denominators, common denominators, and the least common denominator. The resource consists of images, explanations, examples with solutions, and a...
CK-12 Foundation
Ck 12: Fraction Comparison With Lowest Common Denominators
[Free Registration/Login may be required to access all resource tools.] Compare fractions using lowest common denominators.
CK-12 Foundation
Ck 12: Elem Math: Subtracting Fractions With Different Denominators
[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...
Khan Academy
Khan Academy: 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.
Khan Academy
Khan Academy: Common Denominators
In this exercise, students practice finding common denominators. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
CK-12 Foundation
Ck 12: 2.3 Adding and Subtracting Rational Expressions
This section explores the process for adding and subtracting rational expressions. It primarily focuses on how to identify and use the Least Common Denominator to combine fractions with rational expressions.
Homeschool Math
Homeschool Math: Finding the (Least) Common Denominator
Students learn about finding a common denominator in fraction addition and subtraction.
CK-12 Foundation
Ck 12: Elem Math: Ordering Fractions With Different Denominators
[Free Registration/Login may be required to access all resource tools.] For this learning module, students are asked to compare fractions with different denominators and put them in order. Includes video demonstrating a sample problem...
Cool Math
Coolmath: Coolmath4kids: Adding and Subtracting Fractions With Different Denominators
Demonstrates how to add and subtract fractions where the denominators are different. Includes sample problems to try.
CK-12 Foundation
Ck 12: Arithmetic: Fraction Ordering With Lowest Common Denominators
[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.
Illustrative Mathematics
Illustrative Mathematics: Finding Common Denominators to Add
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...
Illustrative Mathematics
Illustrative Mathematics: Finding Common Denominators to Subtract
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...
Math Is Fun
Math Is Fun: Definition of Common Denominator
Definitiion of a common denominator with examples.
Houghton Mifflin Harcourt
Houghton Mifflin Harcourt: Saxon Activity Center: Graphing Calculator Activity: Common Denominators [Pdf]
A graphing calculator lesson focusing on common denominator. Lesson contains detailed examples, visual demonstrations with key functions, and practice problems. Acrobat Reader required.