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Pre-algebra - Khan Academy

Pre-algebra - Khan Academy

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Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

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Mysterious negative numbers! What ARE they? They are numbers less than zero. If you understand the nature of below zero temperatures, you can understand negative numbers. We'll help. Practice this ...

How to add and subtract fractions. Practice this lesson yourself on right now: ...

This example clarifies the purpose of order of operations: to have ONE way to interpret a mathematical statement. Practice this lesson yourself on right now: https://www.khanacademy ...

Work through another challenging order of operations example with only positive numbers. Practice this lesson yourself on right now: ...

Intuition on why a^-b = 1/(a^b) (and why a^0 =1) Practice this lesson yourself on right now: ...

Introduction to exponent rules Practice this lesson yourself on right now: ...

2 more exponent rules with an introduction to composite problems Practice this lesson yourself on right now: ...

Using exponent rules to simplify radicals or square roots Practice this lesson yourself on right now: ...

An introduction to logarithms

Introduction to scientific notation. An in-depth discussion about why and how scientific notation is used. Practice this lesson yourself on right now: ...

More scientific notation examples Practice this lesson yourself on right now: ...

Future doctors and nurses out there, take note. This unit conversion word problem deals with converting drug dosage units, something that is commonly done in hospitals. Give it a try with us. Pract ...

Common Divisibility Examples Practice this lesson yourself on right now: ...

Understanding how numbers are represented. Introduction to binary numbers

Converting between decimal, binary and hexadecimal number systems

Introduction to significant figures Practice this lesson yourself on right now: ...

Understanding the "rules of thumb" for significant figures Practice this lesson yourself on right now: ...

Multiplying and dividing with significant figures Practice this lesson yourself on right now: ...

Addition and Subtraction with Significant Figures Practice this lesson yourself on right now: ...

Pure Numbers and Significant Digits

Is -40 bigger than -10? When ordering negative numbers from least to greatest, careful that you don't get hung up on the "amount" of the number. Think about what that negative sign really means! Pr ...

When we compare numbers we use the concepts of greater than, less than, and equal to (=). The same is true of absolute values. Practice this lesson yourself on right now: https://ww ...

Finding common denominators of multiple fractions to order them Practice this lesson yourself on right now: ...

Simple idea that multiplying by a numbers multiplicative inverse gets you back to one

Interpreting Linear Graphs Practice this lesson yourself on right now: ...


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