# What is the prefix for twenty?

## What is the prefix for twenty?

viginti-

Table of number prefixes in English

Number | Latin prefixes | Greek prefixes |
---|---|---|

Cardinal | Cardinal | |

18 | octodec- | octo(kai)deca-, decaocto- |

19 | novemdec-, novendec- | ennea(kai)deca-, decaennea- |

20 | viginti- | (e)icosi- |

**What are the prefixes for 7?**

prefix | number indicated |
---|---|

penta- | 5 |

hexa- | 6 |

hepta- | 7 |

octa- | 8 |

### What number is DECA?

ten

Deca (International spelling as used by the International Bureau of Weights and Measures; symbol: da) or deka (American spelling) is a decimal unit prefix in the metric system denoting a factor of ten. The term is derived from the Greek déka (δέκα) meaning ten.

**What number is HEPT?**

7

IUPAC numerical multiplier

Number | Multiplier |
---|---|

5 | penta- |

6 | hexa- |

7 | hepta- |

8 | octa- |

## What does uni mean in numbers?

1

Common Number Prefixes and Their Meanings

Prefix | Number |
---|---|

uni- mono- | 1 |

bi- di- | 2 |

tri- | 3 |

quad-, quart- tetra- | 4 |

**What are the first 10 prefixes?**

10 Cards in this Set

1 | mono- |
---|---|

7 | hepta- |

8 | octa- |

9 | nona- |

10 | deca- |

### What does Hepta mean?

seven

Hepta- is a combining form used like a prefix meaning “seven.” It is used in a number of scientific and other technical terms. In chemistry, hepta- is specifically used to indicate seven atoms or seven groups of atoms in compounds, e.g., heptachlor.