Week of Jan 5-9

​Introduction to Ratios

By Dasia Garvin

Open Ended

What is a ratio? If you're not sure, what do you think it is?

Ratio

A ratio is a way of comparing two quantities.

For example: Look at the picture.

How many books?
How many pencils?

Sometimes ratio compare a part and a part, while other times they compare a part and a whole.

There are 3 ways to write ratios.

1. As a fraction.

2. With a colon :

3. Using the word "to"

ORDER MATTERS! Our words matter...

What is the ratio of pencils to books?



What is the ratio of books to pencils?





This is considered a part to part ratio.

Ex: A soccer team played 19 games and won 10. What is the ratio of the number of wins to the number of games played?

Ex: A soccer team played 19 games and won 10. What is the ratio of the number of wins to the number of losses?

​Ratios must also be written in simplest form.

We will talk more about that tomorrow.

Fill in the Blank

What is the ratio of red shirts to blue shirts?

:

Replace this with a header

​Replace with sub-header

Replace this with your body text. Duplicate this text as many times as you would like. All provided templates can be reused multiple times. Wish you a good day.

Happy teaching!

Fill in the Blank

What is the ratio of triangles to rhombuses?

:

Fill in the Blank

A car factory made 39 grey cars and 3 white cars. What is the ratio of the number of white cars to the number of grey cars?

:

Fill in the Blank

There are 11 men and 10 women participating in a race. What is the ratio of the number of men participating to total amount of people participating?

:

Fill in the Blank

A cinema sold 5 child tickets. The other 47 tickets sold were adult tickets. What is the ratio of the number of child tickets to the total number of tickets?

:

Simplifying Ratios

Let's begin with a quick review of yesterday.

Open Ended

A street artist has three colors of paint. They have 4 cans of orange, 7 cans of green, and 8 cans of purple. What does the ratio 8:19 represent in this situation? Explain your reasoning.

Fill in the Blank

The puppies in a litter are either black or brown. The ratio of black puppies to the total number of puppies is 3:8. What is the ratio of brown puppies to black puppies?

: