Review For Videos 200-204

The following 11-question review covers the material on videos 200 through 204:

It covers the following subjects:

  • Arithmetic series
  • Complementary and supplementary angles
  • Vertical angles
  • Isoceles, scalene, and equilateral triangles
  • Acute, obtuse, and right angles
  • Triangle angle sum theorem
  • Solving word problems
  • Order of operations

Triangle Theorems


This video covers the following topics:

Triangle angle sum theorem:  The sum of a triangle’s angles equals 180 degrees.

Triangle inequality theorem:  In any triangle, the sum of any two sides must be greater than the other side.

Video #202

Geometry Vocabulary

This two-part video covers geometry vocabulary.

Part A:

Part B:

This video covers the following definitions:

  • right angle
  • acute angle
  • obtuse angle
  • straight angles
  • adjacent angles
  • complementary angles
  • supplementary angles
  • vertical angles

This is Video #201.

Welcome to

Welcome to!  This site is designed to help parents help their students as they struggle with the concepts covered in the sixth grade Common Core math curriculum.

Common Core covers a lot of material.  And because of the constraints of the curriculum, teachers are often forced to cover it fast, and they are often forced to cover it in ways that are lacking in clarity.

As I worked with my own son, I discovered one important secret:  Most of the material is very elementary, and students shouldn’t have any trouble understanding it, if it’s presented in a clear manner.  But the layout of the curriculum does not encourage clarity.  I found that I needed to present the material to my son in a clear and understandable way.  And as soon as I presented the material clearly, both my son and I realized how simple it really was.

Since my explanations helped my own son, I assume that other parents and students can benefit as well.  Therefore, I will be posting this series of videos, and over the course of the year, I will have explained the entire sixth grade Common Core curriculum.

In my introductory video for parents, I explain more: