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Introduction to Ratios

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Jennifer Lloyd

on 18 November 2013

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Transcript of Introduction to Ratios

Ratios and Proportional Relationships
6RP-Understand ratio concepts and use ratio reasoning to solve problems
6.RP.1. Understand the concept of a ratio and use ratio language to describe a ratio relationship between two quantities.
The "Lucky Charms" Question?
Have you ever had Lucky Charms cereal?
Are there more marshmallows or oat pieces in a box of Lucky Charms?
Predict how many marshmallows pieces are 1 box.
Predict how many oat pieces are in 1 box
Compare your definition of a ratio compared to the one on the diagram below
Use your graphic organizer to "organize" your thoughts
Make a prediction about "Part-to-Part" versus "Part-to-Whole" Ratios
Use your own words to answer the questions
What types of problems will I solve?
• Pianos and pipe organs contain keyboards, a portion of which is shown below.
What is the ratio of black keys to white keys in the picture above?
If the pattern shown continues, how many black keys appear on a portable keyboard with 108 white keys? Hint: How can you demonstrate all steps visually?
Write each fraction in simplest form.

5/9 is bigger than 3/10 because 5/9 is about 0.55 and 3/10 = 0.3

3) Which fraction above has the greatest value?


OBJECTIVE: Students will write real-world quantities as ratios and explain their meaning.
Language Objective: Students will define ratio and will be introduced to ratio language.


Warm Up

Things to consider:
What operation is used to simplify a fraction (use correct vocabulary)
How do you convert a fraction to a percentage?
Write down all of the vocabulary associated with fractions
What does the word "quantity" mean?
Take a minute to write down all of the vocabulary and terminology that you currently know about ratios, including real life situations that require the use of a ratio.
Write down a prediction as to how this problem will be solved.
How do you think we will solve the "Piano Task" presented earlier in this presentation?
Exit Ticket...
What did you learn about ratios that you did not already know?
There are 287 marshmallow pieces and 2,583 Oat Pieces in 1 box of Lucky Charms.

We can write this real-world situation as a ratio!
A ratio is a comparison of two different quantities.

1) A Fraction
2) Using the word "to"
3) Using a colon :
We can write a ratio in 3 different ways...
Think about this one...
After you decide how the ratio will be written, does the order in which it is written matter?
For Example
Write a proportion comparing
# of people to # of pizzas for each picture
How are the ratios above alike similar?
Does the order matter when writing the ratio?
1 person to 4 pizzas
4 people to 1 pizza
Full transcript