HeyMath! was founded in May 2000 by Nirmala Sankaran and Harsh Rajan on a worldview that there is no perfect education system. We're based in Chennai, India, and are privately funded. Contact our founders.

We've made it our mission to create a flat world video curriculum by diligently seeking out proven best practices from great teachers and discerning parents around the world. Our highly capable Math editors then blend this collective wisdom into bite-sized animated and interactive explanations that provide concept clarification visually and help remove the fear of Math. HeyMath! lessons are developed with advice from the University of Cambridge and endorsed by the Singapore Teachers' Union.

The resources contained in this collection offer a sample of the various lessons available through the HeyMath! program.

- Mathematics > General
- Mathematics > Algebra
- Mathematics > Geometry
- Mathematics > Graphing
- Mathematics > Measurement
- Mathematics > Number Sense & Operations
- Mathematics > Patterns

- Grade 9
- Grade 10
- Grade 11
- Grade 12

Represent a fraction 1/b on a number line diagram by defining the interval from 0 to 1 as the whole and partitioning it into b equal parts. Recognize that each part has size 1/b and that the endpoint of the part based at 0 locates the number 1/b on the number line.

Represent a fraction a/b on a number line diagram by marking off a lengths 1/b from 0. Recognize that the resulting interval has size a/b and that its endpoint locates the number a/b on the number line.

Understand two fractions as equivalent (equal) if they are the same size, or the same point on a number line.