National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Fraction Basics
Gives a very basic overview of fractions and their parts. Discusses adding, multiplying, and finding a common denominator.
Lawrence Hall of Science
The Math Page: Skill in Algebra: Skill in Algebra: Algebraic Fractions
Explains how to find a common denominator between two rational expressions and how to reduce a fraction that involves factoring. There are example problems solved, problems for the student to attempt, and answers to the student problems....
CK-12 Foundation
Ck 12: Arithmetic: Differences of Fractions
[Free Registration/Login may be required to access all resource tools.] Find differences of fractions with different denominators by renaming them with a common denominator.
Better Lesson
Better Lesson: Finding the Least Common Multiple (Lcm)
The LCM is a useful tool to use when comparing fractions and finding common denominators.
Oswego City School District
Regents Exam Prep Center: Add and Subtract Rational (Fractional) Expressions
Add and subtract rational expressions like a pro after you use this site. Finding common denominators is made easy with this tutorial. Try the example problems to test your knowledge, then check the solutions. The 'Topic Index' page...
Texas Instruments
Texas Instruments: Finding the Gcf
Students simplify fractions by dividing the numerator and denominator by the GCF (the greatest common factor). They check their work by using a calculator.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Formula for Greatest Common Divisor.
This site is a question and response to a student asking Dr. Math about the greatest common divisor, he gives an interesting way to find the gcd, as well as the button on calculators which commonly does the math for you.
CK-12 Foundation
Ck 12: Arithmetic: Differences of Integers Using a Number Line
[Free Registration/Login may be required to access all resource tools.] Use a number line to find the differences of integers.
CK-12 Foundation
Ck 12: Arithmetic: Sums of Mixed Numbers
[Free Registration/Login may be required to access all resource tools.] In this lesson students find the sum of mixed numbers by renaming fractions with a common denominator. Students examine guided notes, review guided practice, watch...
PBS
Pbs: Logical Leaps: Adding Fractions, Mixed Numbers, and Decimals on the Number Line
In this interactive, use logic to solve riddles involving a jumping frog contest. Add two consecutive jumps by one frog and place the jumps on the number line, finding equivalent fractions with common denominators to do so. Numbers are...
PBS
Pbs: Logical Leaps: Adding Fractions and Decimals From 0 to 1 on the Vertical Number Line
In this interactive, use logic to solve riddles involving flea circus high jumps. Then, add two consecutive jumps and place them on a vertical number line. This often requires you to find equivalent fractions with common denominators....
Visual Fractions
Visual Fractions: Rename in Lowest Terms
Practice finding the lowest term name for a variety of different fractions using a number line.
Help Algebra
Help algebra.com: Simplifying Rational Expressions
The process of factoring and canceling is used to simplify, multiply, and divide rational expressions. Adding and subtracting rational expressions is also demonstrated, including finding common denominators.
Quia
Quia: Equivalent Fractions
Use this Web site to practice finding equivalent fractions using a matching game format. CCSS.Math.Content.3.NF.A.3.a Understand two fractions as equivalent (equal) if they are the same size, or the same point on a number line.
Math Is Fun
Math Is Fun: Equivalent Fractions
This very basic website gives simple easy steps on how to find equivalent fractions with practice questions at the end. CCSS.Math.Content.3.NF.A.3.a Understand two fractions as equivalent (equal) if they are the same size, or the same...
Other
Mr. Perez Online Math Tutor: Solving Rational Equations
The mathematics tutorial investigates how to simplify rational equations, find the least common denominator as well as how to solve rational equations. There are notes, examples and an interactive applet as well as a vocabulary puzzle.
PBS
Pbs: Logical Leaps: Adding Rational Numbers on the Number Line
In this interactive, use logic to solve riddles involving a wallaby jumping contest. Add two consecutive jumps and place them on a number line, finding equivalent fractions and common denominators to do so. Backward jumps represent...
Quia
Quia: Equivalent Fractions Concentration
Use this website to practice finding equivalent fractions using a concentration game format. CCSS.Math.Content.3.NF.A.3.b Recognize and generate simple equivalent fractions
Visual Fractions
Visual Fractions: Fraction Division With Lines
Once the dividend is correctly identified, a rectangle representing the divisor will appear. The divisor is the horizontal distance of the blue arrow. The program will not continue unless the dividend or the divisor are correctly...
Lawrence Hall of Science
The Math Page: Skill in Algebra: Equations With Fractions
Here is a site that clearly and thoroughly explains solving equations with fractions by finding the least common multiple of the denominators and clearing the fractions. There are example problems solved, problems for the student to...