Defining integers in 15 seconds using positive and negative numbers on a number line and discussing numbers that aren't integers with InstaCram from the *Math Club*.

Discussing the value of integers in 15 seconds using a number line and exploring how to determine increasing and decreasing value of positive and negative numbers on a number line with InstaCram from the *Math Club*.

In this video from *Cyberchase*, Bianca is babysitting infant twins. As she tries to give each twin the same amount of liquid baby formula, she discovers that all the baby bottles are different shapes. Learn how she finds two that hold the same amount. In the accompanying classroom activity, students estimate which of four empty containers has the greatest capacity and then determine which one does by measuring actual volume. This resource is part of the Math at the Core: Middle School Collection.

Illustrating the rules of addition of positive and negative numbers with a number line in 15 seconds with InstaCram from the *Math Club*.

Discover the importance of order of operations when solving an expression. This video focuses on implementing PEMDAS and demonstrates the reason we need order of operation by solving a single expression in three different, two incorrect, ways. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

Doubling something isn't always easy! See if you can figure out why if Tito sells his new pizza for $19.99 he'll be in trouble. Use what you know about area, rates, and proportions to figure out how much Tito should charge or what the dimensions of the new pizza should be in this real world application of math.

Calculating rates of change can be tough! See if you can figure out why Pete's claim that his iguana grew more than Pauly's is wrong. Use what you know about measurement, fractions, and rates to figure out which iguana grew more in this real world application of math.

Carla’s birthday cash is burning a hole in her pocket, but the stores downtown have her in a bind! Her favorite three stores all have sales – “Buy Two Get One Free,” “40% off Everything,” and “Buy One Get One Half Off.” Which sale will give Carla the most bang for her buck?

Watch as the "Wall of Fire" in the National Museum of Mathematics shows the relationship between two and three-dimensional figures. This video focuses on the 2D cross sections that can be observed when a laser projects through a 3D tetrahedron. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

This video presents a visual model for solving a word problem involving the multiplication of fractions. The problem asks students to use the amount of bamboo that a panda eats in an hour to determine how much he eats in a quarter of an hour if he eats at a steady rate. The video ends with a challenge problem for students to model themselves. In the accompanying classroom activity, students use visual models to work through the challenge problem. This resource is part of the Math at the Core: Middle School Collection.