# Pre-algebra - Khan Academy

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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## 1) Negative numbers introduction | Negative numbers and absolute value | Pre-Algebra## 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 ... |

## 2) Adding/subtracting negative numbers | Pre-Algebra## Adding and subtracting negative numbers |

## 3) Multiplying and dividing negative numbers | Pre-Algebra## Multiplying and dividing negative numbers |

## 4) Adding and subtracting fractions | Fractions | Pre-Algebra## How to add and subtract fractions. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 5) Multiplying fractions (old)## Multiplying fractions |

## 6) Dividing fractions## Dividing fractions |

## 7) Introduction to order of operations | Arithmetic properties | Pre-Algebra## This example clarifies the purpose of order of operations: to have ONE way to interpret a mathematical statement. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy ... |

## 8) Order of operations: PEMDAS | Arithmetic properties | Pre-Algebra## Work through another challenging order of operations example with only positive numbers. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 9) Level 1 Exponents## Basic Exponents |

## 10) Level 2 Exponents## negative exponents |

## 11) Level 3 exponents## fractional exponents |

## 12) Negative exponent intuition | Pre-Algebra## Intuition on why a^-b = 1/(a^b) (and why a^0 =1) Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 13) Exponent rules part 1 | Exponents, radicals, and scientific notation | Pre-Algebra## Introduction to exponent rules Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 14) Exponent rules part 2 | Exponents, radicals, and scientific notation | Pre-Algebra## 2 more exponent rules with an introduction to composite problems Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 15) Simplifying radicals | Exponents, radicals, and scientific notation | Pre-Algebra## Using exponent rules to simplify radicals or square roots Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 16) Introduction to Logarithms## An introduction to logarithms |

## 17) Unit conversion within the metric system | Pre-Algebra## Metric unit conversion |

## 18) Speed translation | Ratios, proportions, units, and rates | Pre-Algebra## Translating speed units |

## 19) Introduction to logarithm properties | Logarithms | Algebra II## Introduction to the first two logarithm properties. |

## 20) Introduction to logarithm properties (part 2) | Logarithms | Algebra II## Second part of the introduction to logarithm properties. |

## 21) Introduction to scientific notation | Pre-Algebra## Introduction to scientific notation. An in-depth discussion about why and how scientific notation is used. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/ma ... |

## 22) Scientific notation examples | Pre-Algebra## More scientific notation examples Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 23) Unit conversion word problem: drug dosage | Introduction to algebra | Algebra I## 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 ... |

## 24) Common divisibility examples | Factors and multiples | Pre-Algebra## Common Divisibility Examples Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 25) Binary Numbers## Understanding how numbers are represented. Introduction to binary numbers |

## 26) Binary, Decimal and Hexadecimal Number Systems## Conceptualizing different number systems |

## 27) Number Base Conversion Practice## Converting between decimal, binary and hexadecimal number systems |

## 28) Significant figures | Decimals | Pre-Algebra## Introduction to significant figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 29) More on significant figures | Decimals | Pre-Algebra## Understanding the "rules of thumb" for significant figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 30) Multiplying and dividing with significant figures | Decimals | Pre-Algebra## Multiplying and dividing with significant figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 31) Addition and subtraction with significant figures | Decimals | Pre-Algebra## Addition and Subtraction with Significant Figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 32) Pure Numbers and Significant Digits## Pure Numbers and Significant Digits |

## 33) Ordering negative numbers | Negative numbers and absolute value | Pre-Algebra## 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 ... |

## 34) Comparing absolute values | Negative numbers and absolute value | Pre-Algebra## 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 KhanAcademy.org right now: https://ww ... |

## 35) Comparing and ordering fractions | Fractions | Pre-Algebra## Finding common denominators of multiple fractions to order them Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 36) Inverse property of multiplication | Arithmetic properties | Pre-Algebra## Simple idea that multiplying by a numbers multiplicative inverse gets you back to one |

## 37) Inverse property of addition | Arithmetic properties | Pre-Algebra## The simple idea that a number plus its negative is 0 |

## 38) Interpreting linear graphs word problems example 1 | Algebra I## Interpreting Linear Graphs Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/a ... |

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