Our founder, Dr. Yan, has watched many online math videos. Most have errors and logical flaws. He decided to create videos that are logically correct. We hope you like them.

(-1)x(-1)=1 Video

0*(x)=0 Video

FOIL Method

Pythagorean Theorem

Sum of the angles in a triangle is 180 degrees

30-60--90 triangle rule with derivation

Proving the square root of 2 is irrational

Euclid's Classical Proof of the infinitude of prime numbers

Derivation of the geometric series formula

Triangles, Squares, and hexagons are the only regular polygons that tile tile the plane

Cantor's 1/3 set

Finding limits to recursively defined sequences

Compound Fractions made Easy

Simplifying Rational Expressions ( same as above )

A sample proof by induction

AMC 8 Exam prep

AMC 8 2019 Exam review