## Expand/Collapse Khan Academy Mathematics Showcase

Like the exemplary videos below, the Khan Academy lessons connect to Common Core standards and are designed to provide students with clear understandings of mathematical operations and principles for problem solving.

Bring clarity to the classroom with these video resources that run between 2 -15 minutes each. Search PBS LearningMedia for “Khan Academy” to find more resources and filter your view by grade level or specific subject to find precisely what you need.

• ## Introduction to Perimeter

Learn how to find the perimeter of various regular and irregular shapes by adding side-lengths.

• ## Introduction to Equivalent Fractions

Ever had to share a pizza and got stuck with a smaller piece? Not fair! We're here to stand up for your delicious, hot equal pizza slice.

• ## Dividing Whole Numbers and Fractions: How Many T-Shirts Can I Make?

Dividing a whole number by a fraction? Turn the tables and multiply by the reciprocal of the fraction.

• ## Solving Basic Equations: Simple Equations of the Form ax = b

Here's an introduction to basic algebraic equations of the form of ax=b.

• ## Order of Operations: PEMDAS

Work through another challenging order of operations example with only positive numbers.

• ## Solving Systems of Equations Visually: the Troll Riddle

Solve systems of equations visually, using the Troll Riddle as an example.

• ## Slope of a Line: Slope and y-Intercept Intuition

This module explains how a line's graph changes when its slope or y-intercept is changed.