A **Rational Number** can be do by splitting two integers.

You are watching: Is -12 a rational number**(An essence is a number through no fountain part.)**

### Example:

**1.5 is a rational number** due to the fact that 1.5 = 3/2 (3 and also 2 are both integers)

NumberAs a FractionRational?

5 | 5/1 | Yes |

1.75 | 7/4 | Yes |

.001 | 1/1000 | Yes |

−0.1 | −1/10 | Yes |

0.111... | 1/9 | Yes |

√2(square root of 2) | ? | NO ! |

Oops! The square root of 2 cannot be composed as a basic fraction! and there room many more such numbers, and because they room **not rational** lock are called Irrational.

Another renowned **irrational** number is Pi (π):

## Formal definition of reasonable Number

More formally us say:

A rational number is a number that deserve to be in the form** p/q****where p** and **q** space integers and **q** is no equal to zero.

pqp / q=

1 | 1 | 1/1 | 1 |

1 | 2 | 1/2 | 0.5 |

55 | 100 | 55/100 | 0.55 |

1 | 1000 | 1/1000 | 0.001 |

253 | 10 | 253/10 | 25.3 |

7 | 0 | 7/0 | No! "q" can"t be zero! |

Just remember: q can"t it is in zero

## Using rational Numbers

If a reasonable number is quiet in the form "p/q" it have the right to be a little daunting to use, therefore I have actually a special page on just how to: Add, Subtract, Multiply and also Divide rational Numbers |

### Fun facts ....

See more: What Fractions Are Equivalent To 2/3, Decimal And Fraction Conversion Table

The old greek mathematician **Pythagoras** believed that all numbers were rational, but one the his students **Hippasus** confirmed (using geometry, that is thought) that you could **not** compose the square source of 2 as a fraction, and also so it to be irrational.

But followers of Pythagoras might not expropriate the visibility of irrational numbers, and it is said that Hippasus to be drowned at sea as a penalty from the gods!