Transcript I can find equal ratios for sets of data.

I can find equal ratios for sets of
data.
Think about it….
What fraction of objects are squares?
What is the ratio of triangles to squares?
In your notes….
Ratio
Comparison of two numbers by
division.
Written 3 ways
1.3 to 4
2.3 : 4
3.3/4
Write the ratio in three different ways
• In a certain district, schools average 182
pupils for every 10 teachers.
• In a recent year, 41 out of 250 people
liked Justin Beiber.
• 284 out of 1,000 people are 15-17 years
old.
• 7 out of every 10 people have visited
California.
7th grade students asked whether they like
pizza or hamburgers better.
McClain
Merriman
Wildish
Hamburgers
10
8
12
Pizza
12
17
17
1. In Mrs. McClain’s room what is the ratio of students who prefer
hamburgers to pizza?
2. Combine the totals for all three rooms. What is the ratio of the
number of students who prefer pizza to the number of students who
prefer hamburgers?
Write each ratio in simplest form
(reduce just like fractions)
•
•
•
•
•
2:6
3:21
16 to 20
3/30
49: 14
Express each ratio as a decimal
(Divide the first number by the 2nd number)
•
•
•
•
7:8
8/3
12:25
1:2
0.9
2.7
0.5
0.5
Write two equivalent ratios
•
•
•
•
•
26:54
212:100
18:36
1:2
9:10
Mr. Burns class has a ratio of 13 male students
to 14 female students. The entire school
population has 273 male students and 294
female students. Is this the same as the ratio
in Mr. Burn’s class?
An average adult male gorilla living in the wild
weighs about 350 lb. In zoos, an adult male
gorilla can weigh about 750 lb. Write a ratio
in simplest form to compare the weights of
the gorillas in the two different habitats.
7/15
Challenge
• A bag contains red, blue, and yellow marbles.
The ratio of red marbles to blue marbles is
1:4. The ratio of blue marbles to yellow
marbles is 2:5. What is the ratio of red
marbles to yellow marbles?
1:10
Wrap up
• What is a ratio?
• Explain the different ways you can express
ratios.
I Can Find Unit Rates
In your notes….
Rate
Unit Rate
A ratio that compares two
quantities measured in different
units.
$10.00/3 pizzas