## Using Mixed Units of Measurement in the U.S. System

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Performing arithmetic operations on measurements with mixed units of measures requires care. Be sure to add or subtract like units.

## Example

Charlie bought three steaks for a barbecue. Their weights were \(14\) ounces, \(1\) pound \(2\) ounces, and \(1\) pound \(6\) ounces. How many total pounds of steak did he buy?

### Solution

We will add the weights of the steaks to find the total weight of the steaks.

Add the ounces. Then add the pounds. | |

Convert 22 ounces to pounds and ounces. | |

Add the pounds. | 2 pounds + 1 pound, 6 ounces 3 pounds, 6 ounces |

Charlie bought 3 pounds 6 ounces of steak. |

## Example

Anthony bought four planks of wood that were each \(6\) feet \(4\) inches long. If the four planks are placed end-to-end, what is the total length of the wood?

### Solution

We will multiply the length of one plank by \(4\) to find the total length.

Multiply the inches and then the feet. | |

Convert 16 inches to feet. | 24 feet + 1 foot 4 inches |

Add the feet. | 25 feet 4 inches |

Anthony bought 25 feet 4 inches of wood. |