# Symbols in Algebra

## Common Symbols Used in Algebra

Symbols save time and space when writing. Here are the most common algebraic symbols:

Symbol | Meaning | Example |
---|---|---|

+ | add | 3+7 = 10 |

− | subtract | 5−2 = 3 |

× | multiply | 4×3 = 12 |

· | multiply (as "×" can look like "x") | 4·3 = 12 |

/ | divide | 20/5 = 4 |

√ | square root ("radical") | √4 = 2 |

cube root | ||

nth root |
||

( ) | grouping symbols (round brackets) | 2(a−3) |

[ ] | grouping symbols (square brackets) | 2[ a−3(b+c) ] |

{ } | set symbols (curly brackets) | {1,2,3} |

= | equals | 1+1 = 2 |

≈ | approximately equal to | π ≈ 3.14 |

≠ | not equal to | π ≠ 2 |

< ≤ | less than, less than or equal to | 2 < 3 |

> ≥ | greater than, greater than or equal to | 5 > 1 |

⇒ | implies (if ... then) | a and b are odd ⇒ a+b is even |

⇔ | "if and only if" or iff or "is equivalent to" |
x=y+1 ⇔ y=x−1 |

∴ | Therefore | a=b ∴ b=a |

! | Factorial | 4! = 4×3×2×1 = 24 |