Khan Academy on a Stick : Negative numbers and absolute value

Khan Academy on a Stick

Arithmetic and pre-algebra

Addition and subtraction
Multiplication and division
Factors and multiples
Negative numbers and absolute value
Decimals
Fractions
Ratios, proportions, units and rates
Exponents, radicals, and scientific notation
Applying mathematical reasoning
Arithmetic properties

Negative Numbers Introduction
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Ordering Negative Numbers
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Ordering negative numbers from least to greatest

Negative number basics

What is a "negative number"? What happens when I add or subtract one of these? If you come to this tutorial armed with the basics of adding an subtracting numbers, you'll learn about what happens in the world below zero! You will learn what negative numbers are and how we can add and subtract them.

Negative Numbers Introduction
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Example: Adding negative numbers
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Adding Negative Numbers
Example: Adding integers with different signs
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Adding integers with different signs
Why Subtracting a Negative Equivalent to Adding a Positive
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Intuition as to why subtracting a negative number is equivalent to adding the absolute value of that number
Negative number word problems 1
Adding decimals of different signs word problem
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Adding/Subtracting negative numbers
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Adding and subtracting negative numbers

Adding and subtracting negative numbers

You understand that negative numbers represent how far we are "below zero". Now you are ready to add and subtract them! In this tutorial, we will explain, give examples, and give practice adding and subtracting negative numbers. This is a super-important concept for the rest of your mathematical career so, no pressure, learn it as well as you can!

Multiplying Positive and Negative Numbers
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Basics of multiplication with negative numbers
Why a Negative Times a Negative is a Positive
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Why negative number products are defined in the way they are.
Why a Negative Times a Negative Makes Intuitive Sense
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Using the repeated addition model of multiplication to think about multiplying negative numbers
Dividing Positive and Negative Numbers
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Basics of dividing with negative numbers
Example: Multiplying numbers with different signs
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U09_L2_T4_we1 Multiplying negative real numbers
Multiplying and dividing negative numbers
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Multiplying and dividing negative numbers

Multiplying and dividing negative numbers

It is starting to dawn on you that negative numbers are incredibly awesome. So awesome that you are feeling embarrassed to think how excited you are about them! Well, the journey is just beginning. In this tutorial we will think about multiplying and dividing numbers throughout the number line!

Absolute Value and Number Lines
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Absolute Value and Number Lines
Absolute Value of Integers
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Absolute Value of Integers
Comparing Absolute Values
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Evaluating and comparing absolute values
Constructing and interpreting absolute value

Absolute value

You'll find absolute value absolutely straightforward--it is just the "distance from zero". If you have a positive number, it is its own absolute value. If you have a negative number, just make it positive to get the absolute value. As you see as you develop mathematically, this idea will eventually extended to more contexts and dimensions, so super important that you understand this core concept now.