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**Natural Numbers** - Common counting numbers.

**Prime Number** - A natural number greater than 1 which has only 1 and itself as factors.

**Composite Number** - A natural number greater than 1 which has more factors than 1 and itself.

**Whole Numbers** - The set of Natural Numbers with the number 0 adjoined.

**Integers** - Whole Numbers with their opposites (negative numbers) adjoined.

**Rational Numbers** - All numbers which can be written as fractions.

**Irrational Numbers** - All numbers which cannot be written as fractions.

**Real Numbers** - The set of Rational Numbers with the set of Irrational Numbers adjoined.

**Complex Number** - A number which can be written in the form a + bi where a and b are real numbers and i is the square root of -1.

A general example to help you recognize patterns and spot the information you're looking for

Type of Number | Example |

Natural Numbers | $$N = 1, 2, 3, 4, ... $$ |

Prime Number | $$P = 2, 3, 5, 7, 11, 13, 17, … $$ |

Composite Number | $$4, 6, 8, 9, 10, 12, ...$$ |

Whole Numbers | $$W = 0, 1, 2, 3, 4, …$$ |

Integers | $$Z= …, -3, -2, -1, 0, 1, 2, 3, …$$ |

Rational Numbers | $$Q = -\frac{1}{2}, 0.33333…, \frac{5}{2}, \frac{11}{10}, … $$ |

Irrational Numbers | $$F = ..., \pi, \sqrt{2}, 0.121221222...$$ |

Real Numbers | $$R = ..., -3, -1, 0, \frac{1}{5}, 1.1, \sqrt{2}, 2, 3, \pi , …$$ |

Complex Number | $$C = ..., -3 + 2i, 0, 1 + 3i, …$$ |

Everyday. Numbers are included in all aspects of math.

Watch a Khan Academy Video »

*Length: 8:48*

- Last Updated: Nov 18, 2022 11:50 AM
- URL: https://davenport.libguides.com/math-skills-overview
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