The scale on a map is 1 cm = 10 miles. Find the length on the map of 300 miles

Our scale is 1 cm to 10 miles

We need to find how many cm exist in 300 miles, so we set up a proportion

1 cm | |

10 miles |

= |

x |

300 miles |

10 miles(x) = 1 cm * 300 miles

10 miles(x) | |

10 miles |

= |

1 cm * 300 miles |

10 miles |

x = | 1 cm * 300 |

10 |

x = | 300 cm |

10 |

x =