In this *Cyberchase* video segment, Harry wants to visit his grandmother. He decides that the cheapest way for him to get there is to travel by unicycle, but he wonders if he can get there before dark. Using a line graph, he tries to predict the amount of time it will take to travel the twenty miles, assuming he travels at a constant speed. Once he sets out on his unicycle, he charts his progress on a new line graph. After the first hour he appears to be ahead of schedule, but he is not able to keep up the pace and soon finds himself falling behind.

In this video segment from *Cyberchase*, the CyberSquad must measure two differently-shaped parcels of land to determine which has a larger area. The CyberSquad uses tarps, fence posts, and finally a grid made out of rope to count squares and determine the area of each parcel.

Explore the relationships between the area equations for rectangles and triangles. This video focuses on modeling the area equations for a rectangle and triangle and talks how base and height differ from length and width.

This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers and is part of the Math at the Core: Middle School collection.

Uncover the secret behind the puzzling Monkey Around exhibit at the National Museum of Mathematics. This video focuses on the properties of rotations and challenges your critical thinking skills. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

In this video segment from *Cyberchase,* Harry is snowboarding and wants to do a move on his snowboard known as a "360." He is not sure what exactly a "360" is, but a snowboard instructor teaches him about angles and snowboard moves. Harry finally creates his own snowboard version of a "360."

Use your spatial reasoning skills to calculate the surface area when given a 3D figure. This video focuses on a right rectangular prism and shows you how unit blocks can help you visualize, then calculate the surface area. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers. This resource is part of the Math at the Core: Middle School collection.

Investigate some of the mathematical challenges Boston engineers had to deal with during the Central Artery Tunnel Project (the "Big Dig"). This video focuses on the irregular shape of the casting basin and the volume calculations required to make the casting basin work, taking math out of the classroom and into real world problem solving.

In this video from *Cyberchase*, Harry decides he needs to start a regular workout schedule. He uses a graph to record his progress. In the accompanying classroom activity, students play a ball-balancing game and record their attempts on a graph to build on the concepts presented in the video. This resource is part of the Math at the Core: Middle School Collection.

Whether flying a plane, figuring out the size of a tiered cake, or riding your bike, slope is important! Get excited about rise over run by viewing this math lesson that walks you through a few of the many resources available to help you understand the concept of slope from that are available from PBS LearningMedia. This lesson demonstrates interactives from the Math at the Core: Middle School collection and was hosted by PBS LearningMedia and Google's Connected Classrooms.

Learn how unit cubes can be used to model the solution for the volume of a 3D figure This video focuses on calculating the volume of a rectangular prism using the equation, length x width x height. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

Learn how algebra can quickly determine the point where two lines intersect. This video focuses on setting linear equations equal to each other to find a common solution.

This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers and is part of the Math at the Core: Middle School collection.

Estimate the volume you get when you fill 3D shapes with candy. This video focuses on estimating volume using nonstandard units, using the volume equation to get a more reliable estimate and checking your estimate by counting the nonstandard units. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

Revealing multiple ways to find volume using a Rubik's cube. This video focuses on modeling volume and explaining why two different volume equations will give you the same answer.

This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers and is part of the Math at the Core: Middle School collection.

Use mathematics to determine what is required to beat world champion Usain Bolt in a 200-meter race. This video focuses on systems of equations that are visualized by completing a table of values and looking for a point of intersection in a set of line graphs. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

This resource is part of the Math at the Core: Middle School collection.

An inclinometer, for measuring unreachable heights and more! This easily made sighting device can measure the angles of lines of sight. Students will gain hands-on insight into understanding and measuring different angles.