Transcript Ratios - msfalconer

Ratios
Lesson 2
Ratios
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
A ratio is a comparison between two numbers
measured in the same units
It can be written in three different ways:
5 to 2
5:2
5
2
Equal Ratios
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When two ratios name the same number,
they are equal. It’s like writing an equivalent
fraction.
20 : 30
Equal Ratios:
10 : 15 2 : 3 80 : 120
Ratios
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It is common for ratios to be written as
fractions
Proportion
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A fractional statement of equality
between two ratios
Eg. 150 = 10
15
1
Example
Charles works as a cook in a restaurant.
His chicken soup recipe contains:
-11 cups of broth
-5 cups of diced vegetables
-3 cups of rice
-3 cups of chopped chicken

He wants to make the recipe at home
for his parents. To reduce the recipe
yield, he needs to know what the ratios
are between the quantities of
ingredients.
a)
What is the ratio of vegetables to
chicken?
b) What is the ratio of broth to
vegetables?
c) What is the ratio of chicken to rice?
d) What is the ratio of the chicken to the
total ingredients?
Example 2
Tom and Susan make $180.00 from a
garage sale. Tom contributed fewer items
to the sale so the money is to be divided
in the ratio of 1:2. How much money will
each person receive?
Homework Time
Pg. 16 #3- #8