## Addition

## Subtraction

- Subtraction basics
- Long subtraction
- Step by step explanation of long subtraction

( interactive widget)

## Multiplication

- Multiplication basics
- Another look at multiplication (with an interactive table)

( interactive widget) - Long multiplication explained
- Step by step explanation of long multiplication

( interactive widget) - Times Table Practice (Click to Reveal)
- Timed Times Table Practice (Click to Reveal)
- Times Table Practice (You're the Teacher)
- Times Table Practice (Timed Questions)

## Division

- Division basics
- Long division explained
- Long division with decimals
- Step by step explanation of long division

( interactive widget)

## Types of Numbers

- Even Numbers
- Integers
- Natural Numbers
- Natural Whole Integers
- Odd Numbers
- Prime Numbers
- Square Numbers
- Whole Numbers
**[more...]**

## Square Roots

## Fractions

- What are fractions?
- Adding fractions
- Subtracting fractions
- Multiplying fractions
- Dividing fractions
- Simplifying fractions
- Converting fractions
**[more...]**

## Percentages

- percentages
- percentages (adding percentages)
- percentages (converting percentages to decimals)
- percentage (converting percentages to fractions)
- percentages (how to express one number as a percentage of another)
- percentages (how to find a percentage change)
- percentages (how to find the percentage of a number)
- percentages (subtracting percentages)

## Popular Algebra Lessons

- Introduction to Algebra
- Solving algebraic equations with addition
- Solving algebraic equations with subtraction
- Solving algebraic equations with multiplication
- Solving algebraic equations with division

## Popular Lessons about Algebraic Equations

- What is an equation?
- Linear equations
- Create a graph of a linear equation ( interactive widget)
**[more...]** - Quadratic equations
- Create a graph of a quadratic equation ( interactive widget)
**[more...]** - Simultaneous equations
- Solving simultaneous equations
**[more...]** - What is a function?

## Popular Lessons about Areas

- Find the area of a square
- Find the area of a rectangle
- Find the area of a triangle
- area (of a parallelogram)
- Find the area of a circle
- Find the area of an ellipse
- Find the area of a trapezoid

## Popular Lessons about Volumes

- Find the volume of a cube
- Find the volume of a sphere
- Find the volume of a cylinder
- Find the volume of a cone

## Angles and Triangles

## Sin, Cos, and Tan

- Introduction to Trigonometry
- using the sine function to find the opposite
- using the sine function to find the hypotenuse
- using the sine function to find the angle
- using the cosine function to find the adjacent
- using the cosine function to find the hypotenuse
- using the cosine function to find the angle
- using the tangent function to find the opposite
- using the tangent function to find the adjacent
- using the tangent function to find the angle

## Glossary of Terms

A

- absolute value
- adding fractions
- addition basics
- addition (long addition)
- addition (long addition step by step)
- adding percentages
- angles (types of)
- area (of a circle)
- area (of an ellipse)
- area (of a parallelogram)
- area (of a trapezoid)
- area (of a triangle)
- area (of a rectangle)
- area (of a square)
- arithmetic
- arithmetic (fundamental theorem of)
- arithmetic mean
- arithmetic with negative numbers
- average (mean)
- average (mode)
- average (median)
- averages (calculator) ( interactive widget)

B