# At a Glance - Unit Rate

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.

#### Which Chips are the Better Deal?

 Shmoritos are Shmingles are

#### Unit Rate Example 1

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

#### Unit Rate Example 2

 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.

#### Unit Rate Exercise 1

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

#### Unit Rate Exercise 2

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?

#### Unit Rate Exercise 3

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