# Arithmetic - Khan Academy

Start here if you have very little background in math fundamentals (or just want to make sure you do).

Arithmetic on Khan Academy: So you're ready to have some arithmetic fun? You've come to the right spot! It's the first "official" math topic and chalked full of fun exercises and great videos which help you start your journey towards math mastery. We'll cover the big ones: addition, subtraction, multiplication, and division, of course. But we don't stop there. We'll get into negative numbers, absolute value, decimals, and fractions, too. Learning math should be fun, and we plan on having some with you. Ready to get started?

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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## Lessons hide description |
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## 1) Basic addition | Addition and subtraction | Arithmetic## Introduction to addition. Multiple visual ways to represent addition. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 2) Addition 2## Adding 2-digit numbers |

## 3) Level 2 Addition## Adding a 2 digit number to a 1 digit number. Introduction to carrying. More free lessons at: http://www.khanacademy.org/video?v=27Kp7 |

## 4) Addition 3## Practice carrying digits to add multiple digit numbers |

## 5) Addition 4 | Addition and subtraction | Arithmetic## More practice carrying with multiple digit numbers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 6) Basic subtraction | Addition and subtraction | Arithmetic## Introduction to subtraction Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 7) Subtraction 2 | Addition and subtraction | Arithmetic## Different ways to view subtraction Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 8) Subtraction 3: Introduction to Borrowing or Regrouping## Introduction to borrowing and regrouping |

## 9) Alternate mental subtraction method | Addition and subtraction | Arithmetic## How I subtract in my head Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 10) Why borrowing works## An explanation of why (not how) borrowing/regrouping works when subtracting numbers |

## 11) Level 4 Subtraction## Subtraction of multi-digit numbers involving borrowing |

## 12) Adding Decimals (Old)## Adding decimals |

## 13) Subtracting decimals (old) | Decimals | Pre-Algebra## Subtracting decimal numbers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 14) Basic multiplication | Multiplication and division | Arithmetic## Introduction to multiplication Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 15) Multiplication 2: The multiplication tables | Arithmetic## Introduction to the multiplication tables from 2-9. |

## 16) Multiplication 3: 10,11,12 times tables | Multiplication and division | Arithmetic## Multiplication 3: Learning to multiply 10, 11, and 12. |

## 17) 2-digit times a 2-digit number | Multiplication and division | Arithmetic## Multiplying a 2-digit number times a 2-digit number Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 18) Multiplying multiple digit numbers | Multiplication and division | Arithmetic## Working our way up to multiplying multiple-digit numbers with each other. We'll go slow so you can follow along. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy. ... |

## 19) Multiplication 7: Old video giving more examples | Arithmetic## 2 examples of multiplying a 3 digit number times a 2 digit number. 1 example of multiplying a 3 digit number times a 3 digit number. |

## 20) Mulitplication 8: Multiplying decimals (Old video)## Multiplying decimals (www.khanacademy.org) |

## 21) Lattice multiplication | Multiplication and division | Arithmetic## Introduction to lattice multiplication |

## 22) Why lattice multiplication works | Multiplication and division | Arithmetic## Understanding why lattice multiplication works |

## 23) Division 1 | Multiplication and division | Arithmetic## Introduction to division Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 24) Introduction to long division | Multiplication and division | Arithmetic## Dividing into larger numbers. Introduction to long division without remainders Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 25) Dividing numbers: long division with remainders | Arithmetic## Here we go with more long division practice. Ever wonder why we call it "long" division? What's "long" about it, anyway? Practice this lesson yourself on KhanAcademy.org right now: https://www.khan ... |

## 26) Level 4 division | Multiplication and division | Arithmetic## Here's another practice example where you divide by two digits. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ... |

## 27) Converting fractions to decimals | Decimals | Pre-Algebra## How to express a fraction as a decimal Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 28) Percent and decimals## Expressing percentages as decimals. Expressing decimals as percentages. |

## 29) Dividing decimals with hundredths example 3 | Decimals | Pre-Algebra## The old saying is "practice makes perfect." Let's keep practicing dividing decimals and making our divisor a whole number. Practice this lesson yourself on KhanAcademy.org right now: https://www.kh ... |

## 30) Ordering Numeric Expressions## Converting percentages and fractions to decimals to order numbers |

## 31) Greatest common factor explained | Factors and multiples | Pre-Algebra## Here's a nice explanation of least common factor (or least common divisor) along with a few practice example exercises. Let's roll. Practice this lesson yourself on KhanAcademy.org right now: https ... |

## 32) Equivalent fractions | Fractions | Pre-Algebra## Introduces the concept of equivalent fractions Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 33) Mixed numbers and improper fractions | Fractions | Pre-Algebra## Converting mixed numbers to improper fractions and improper fractions to mixed numbers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-alg ... |

## 34) Time Differences 1## Finding how long passes between two times |

## 35) Time Differences in Different Time Zones## Calculating flight times across time zones |

## 36) Prime numbers | Factors and multiples | Pre-Algebra## What does it mean to be a prime number? Let's progress though some whole numbers and ask ourselves if they meet the criteria. What is the criteria you ask? Watch. Practice this lesson yourself on K ... |

## 37) Partial quotient method of division | Multiplication and division | Arithmetic## An alternate to traditional long division |

## 38) Partial quotient method of division 2 | Multiplication and division | Arithmetic## Another example of doing long division using the partial quotient method |

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