Objective I can use ratio language to describe the relationship between two quantities Ratios What is a ratio A ratio is a comparison of two quantities Uses division to compare two number It shows how many times as great one quantity is to another ID: 674475
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Slide1
Ratios
Regular
Textbook Page 402-406Slide2
Objective
I can use ratio language to describe the relationship between two quantities.Slide3
Ratios
What is a ratio?
A ratio is a comparison of two quantities. (Uses division to compare two number)
It shows how many times as great one quantity is to another.
The numbers in the ratio are called
terms
.Slide4
There are several ways to write ratios!
Team
Wins
Loses
Firelands
8
3
Keystone72Oberlin64
There are three ways to write ratios:
Words Numbers
Wins to losses 8 to 3
Wins
8
losses 3
Wins:losses
8:3
All three ways are read “ the ratio of blank to blank. So 8:3 is read, “the ratio of eight to three.Slide5
Teams
Wins
Losses
Firelands
8
3
Keystone
72Oberlin64
Write a ratio:
A. Keystones wins to losses
7:2 or 7 to 2 or 7/2
Write a ratio of wins to games played for Oberlin.
6 to 10 or 6:10 or 6/10Slide6
Write me a ratio!
Teacher to students in this room.
Students to teachers.
Boys to girls
Boys to all students.Slide7
Ty’s Video Collection
Comedies=8,
Dramas= 3
Cartoons= 2
Sci
Fi=1
Describe the relationship between the drama videos and the
Sci Fi videos.3 to 1Analyze relationships:The ratio of floor seats to balcony seats in a theater are 20:1. Does the theater have more floor seats or more balcony seats. How do you know?Slide8
Equivalent Ratios are?
Equivalent Ratios: ratios that name the same comparison or that have the same value.Slide9
Equivalent Ratios
You can find equivalent ratios by using table or multiplying or dividing both terms of the ratio by the same number.Slide10
Multiply both terms by the same number.
Ratio: 3 cats to 5 dogs
You can write an equivalent ratio by multiplying both terms by the same number.
So multiply both terms by 2.
An equivalent ratio would be
6 to 10Slide11
5
n
7 35
N =
What did you do to 7 to get to 35. You must do
the same to 5.Slide12
Some more equivalent Ratios
Write me an equivalent ratio:
6:21
3
9Slide13
You try!
Write a ratio to triangle to rectangles in three ways.
Write me three equivalent ratio for triangles to rectanglesSlide14
Multi step
The ratio of North American Butterflies to south American butterflies at a butterfly park is 5:3. The ratio of South American butterflies to European butterflies is 3:2. There are 30 North American Butterflies at the park.
How many South American butterflies are there?
How many European Butterflies are there?Slide15
Homework
Workbook
Pages
101-102
Odds