Math at the Core: Middle School
Expand/Collapse Math at the Core: Middle School
Find engaging media and integrated activities, all aligned with the Common Core State Standards in Mathematics. Designed for middle school students of diverse learning styles and backgrounds. Produced by a collaborative of public media stations and producers with funding from the Corporation for Public Broadcasting.
Watch an introductory video about the Collection.

Additive Inverse
Learn the meaning of the term additive inverse in this animated Math Shorts video from the Utah Education Network and Planet Nutshell, Inc.
Grades: 7 
Patterns of Factors
Examine the patterns of factors and prime factorization of numbers from 2 to 36 in this interactive from Learning Math.
Grades: 6 
Harry Makes a Big Splash with Positive and Negative Numbers
In this Cyberchase video, Harry examines the results of three different swim times and finds the combinations that offer the lowest overall time.
Grades: 56 
Repeating Decimal Rings
Explore patterns that emerge when you expand certain fractions into decimals in this interactive from Learning Math.
Grades: 78 
Building a Number Line
See how counting, integer, rational, and real numbers are displayed on a number line in this interactive from Learning Math.
Grades: 8 
Addition and Subtraction of Integers
Learn about the addition of integers during a card game in which negative and positive numbers are added together in this video from the Innovation Math Challenge.
Grades: 67 
Fractions, Mixed Numbers, and Decimals on the Number Line
Use logic to solve three riddles involving a frog jumping contest and then place the contestants’ jumps at the correct points on the number line in this interactive from KET.
Grades: 67 
Approximating Square Roots of Nonperfect Squares
Visualize a strategy for approximating the square roots of nonperfect squares in this video from the Innovation Math Challenge.
Grades: 8 
Distributive Property with Variables
Learn how algebra tiles are used to generate equivalent expressions using the distributive property in this video from the Innovation Math Challenge.
Grades: 6 
Keep, Change, Flip
Watch and listen as a hiphop song explains the “keep, change, flip” mnemonic, an approach to dividing fractions, in this video from the Innovation Math Challenge.
Grades: 6 
Adding Fractions and Decimals from 0 to 1 on the Vertical Number Line
Use logic to solve riddles involving flea circus high jumps in this interactive from KET.
Grades: 67 
Fractions and Decimals from 0 to 1 on the Vertical Number Line
Use logic to solve riddles involving a fleajumping contest in this interactive from KET.
Grades: 67 
Adding Rational Numbers on the Number Line
Use logic to solve riddles involving a wallaby jumping contest in this interactive from KET.
Grades: 67 
Rational Numbers on the Number Line
Use logic to solve riddles involving a wallaby jumping contest in this interactive from KET.
Grades: 6 
Adding Fractions, Mixed Numbers, and Decimals on the Number Line
Use logic to solve riddles involving a jumping frog contest in this interactive from KET.
Grades: 67 
Graphing Inequalities: Rational Numbers
Use logic to solve riddles involving a jumping wallaby competition and then place the wallabies on the correct range from –5 to 5 on the number line in this interactive from KET.
Grades: 6 
Graphing Inequalities: Fractions, Mixed Numbers, and Decimals
Use logic to solve three riddles involving a jumping frog competition and then place the frogs on the correct range from 0 to 5 on a number line in this interactive from KET.
Grades: 6 
Graphing Inequalities: Fractions and Decimals from 0 to 1
Use logic to solve riddles involving performers in a flea circus and then place the fleas in the correct range on a vertical number line in this interactive from KET.
Grades: 6 
Greatest Common Factor
Learn how to find the greatest common factor of two numbers and how this can be used to solve problems with large numbers in this Math Shorts video from the Utah Education Network and Planet Nutshell, Inc.
Grades: 6 
Modeling Fraction Division Using Comparison, Group Number Unknown
Learn how to divide fractions to compare the spring weight of a hedgehog with its weight just before hibernation in this video from KET.
Grades: 67