Foundations

This course is a part of Algebra basics, a 8-course Topic series from Khan Academy.

This topic isn't algebra, but it is a survey of all of the most important pre-algebra skills you need to really digest algebra. These skills also tend to be pretty important in life in general!

This course contains 10 segments:

Negative numbers

Understanding and operating with negative numbers is key in algebra. This tutorial will make sure that you have the basics down!

Absolute value

Absolute value is a simple but important property of numbers. Get comfortable with finding the absolute value of numbers and interpreting their meaning.

Exponents

Addition was nice. Multiplication was cooler. In the mood for a new operation that grows numbers even faster? Ever felt like expressing repeated multiplication with less writing? Ever wanted to describe how most things in the universe grow and shrink? Well, exponents are your answer! This tutorial covers everything from basic exponents to negative and fractional ones. It assumes you remember your multiplication, negative numbers and fractions.

Square roots

A strong contender for coolest symbol in mathematics is the radical. What is it? How does it relate to exponents? Learn all about square roots in this tutorial.

Order of operations

In this tutorial, we learn the "order of operations" to evaluate more complex expressions involving exponents, parentheses, multiplication and division, and addition and subtraction.

Fractions

This tutorial will help to review arithmetic with fractions

Decimals, fractions and percentages

Let's review how to convert between fractions, decimals and percentages

Operations with decimals

Add, subtract, multiply, and divide decimals.

Area of triangles

Understand the formula for the area of a triangle.

Circumference and area of circles

Circles are everywhere. How can we measure how big they are? Well, we could think about the distance around the circle (circumference). Another option would be to think about how much space it takes up on our paper (area). Have fun!