**Unit rate **is the ratio of *cost: number of units*. Then the ratio is simplified so that the number of units is 1.

Having a knack for unit rates can make you a smarter shopper. For example, let's say that you are craving some cheesy, crunchy goodness and are trying to decide between two bags of chips. The Shmoritos are $4.50 for 12 oz. Shmingles are $2.50 for 7.75 oz. You obviously want the most munch for your money, so which bag to buy?

To solve this crunchy conundrum, compare the *price per ounce* for each bag.

## Unit Rate Practice:

Shmoritos are | Shmingles are |

Divide the numerator and denominator by 12 to get the unit price. | Divide the numerator and denominator by 12 to get the unit price. |

| Shmingles are the best bet for your dollar. That's a good thing, 'cuz you can't eat just one! |

Shmunkin Donuts offers a baker's dozen (13 doughnuts) for $4.94. What is the unit cost? | |

The ratio of cost per units is: Find the unit cost by dividing the numerator and denominator by 13 | |

So, the cost per doughnut is $0.38 (yum!). | |

Your local grocery store is having a special on Vitamin Water. They are selling a 12-pack of 20 oz bottles for $11.50. The 32 oz bottles are also on sale for $1.45. Should you buy one 12-pack of 20 oz bottles or eight 32 oz bottles? | This one is a bit tricky because we can't compare the cost per bottle, since the bottles are different sizes. Instead, we need to compare the cost per total ounces. |

The 12-pack has a total of , so its unit cost (cost per ounce) is: | |

If you buy eight 32 oz bottles that is a total of at a cost of . So the unit cost is: | So, you might as well purchase 8 of the 32 oz bottles and make your money go further. |

A 12-pack box of Pop Shmarts costs $2.50. What is the cost per shmart?

Answer

about $0.21 / shmart

A 6-bar box of Grizzly Bear Granola Bars is $3.50. However, a 12-bar case of Wally’s Walnut Bars is $7.25. Which bar is the better buy?

Hint

compare cost per total number of bars

Answer

Grizzy Bear Granola Bars

A bag of 45 Shmoreo cookies is $4.50. The bag of 30 Shmutter Butter cookies is $3.00. Which is the better buy?

Hint

compare the cost per number of cookies

Answer

they are equal in cost