Opening rates vs unit rates.notebook
September 03, 2015
Ratio: A comparison of two quantities by division. It is sometimes expressed as a fraction. There are three ways to write a ratio. Example: 1) 14 girls to 7 boys
2) 14 : 7
3) Aug 31­11:48 AM
Example 1)
A basket of fruit contains 6 apples, 4 bananas, and 3 oranges.
Write each ratio in all three forms.
a. bananas to apples
b. bananas and apples to oranges
c. oranges to total pieces of fruit
Aug 31­11:49 AM
1
Opening rates vs unit rates.notebook
September 03, 2015
Unit Rate: A ratio that compares two
quantities that have different units of
measure. In a unit rate, the second quantity in
the comparison is 1 unit ( has a denominator of
one unit).
Which Examples would be a Unit Rate?:
*Fruit for $0.49 per pound.
*3 items for $10
*$0.59 for a 12-ounce can of pineapples
*a car lease for $289 a month
Dec 4­9:43 AM
Rates Vs. Unit Rates
Rate
Unit Rate
~The rate ~Rates can be simplified
for ONE unit.
Compares two different kinds 180 words in of quantities or measurements
4 minutes
~Ex.) ~The denominator is ALWAYS 1
~Ex.) 45 words per minute
Dec 4­9:41 AM
2
Opening rates vs unit rates.notebook
September 03, 2015
Unit rates are used to compare the costs of items in a
grocery store.
For example if eight ounces of orange juice cost $2.25 and
twelve ounces of juice costs $3.25, you would calculate the
unit rate to determine which container was the cheapest.
=
Unit rate is $0.28 for 1 ounce
=
Unit rate is $0.27 for 1 ounce
Is there another way to solve this problem?
Dec 4­9:42 AM
Speed limit is a unit rate because it is measured as the number
of miles traveled per 1 hour. So, 55 miles per hour is a unit
rate, whereas 110 miles per 2 hours is not a unit rate (because
the second measurement, time, has a value of 2, not 1).
Dec 4­9:42 AM
3
Opening rates vs unit rates.notebook
September 03, 2015
Your turn!
Suppose you will bring your favorite beverage to a
family picnic. Suppose a 2-liter bottle of that
beverage costs $4 and a 3-liter bottle on that
beverage costs $4.50.
Which is a better buy?
Be ready to explain how you would solve this
problem.
Dec 4­9:54 AM
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