Intro to Ratios

Intro to Ratios- REVIEW!

Learning Goals!

I will know...

• That a ratio is a comparison between two ______________

• That a ratio can be written in ___ different ways

   $a:b\ \ \ \ \ \ \ \ \ \frac{a}{b}\ \ \ \ \ \ \ \ \ a\ to\ b$  

• The difference between a part-to-part and a part-to-whole ratio

Goal 1: A ratio is a comparison between two quantities

• Find the ratio of tacos to pizza?

• ____________

• Find the ratio of burgers to tacos?

• _____________

• 1 min: Talk with your team and come up with another ratio!

Which of the following is true?

• A) The ratio of dogs to cats is 4:6

• B) The ratio of mice to cats is 2:4

• C) The ratio of mice to dogs is 6:2

• D) The ratio of cats to dogs is 4:6

• E) The ratio of cats to all animals is 4:12

Multiple Choice

Look at the picture to decide,

what is the ratio of boys to girls?

• 4:9

• 5:4

• 4:4

• 4:5

Multiple Choice

Some people like ice cream in a cup, others like it on a cone!

Write the ratio of cups to cones. Pay attention to the order!

• 4:2

• 4:6

• 2:4

• 2:6

Multiple Choice

This necklace has black, white, and orange beads.

What is the ratio of orange to white beads?

• 6:5

• 5:11

• 5:6

• 6:27

Goal 2: I know that a ratio can be written in three different notations (styles)

• The ratio of red squares to blue circles can be written:

• 3:7          3 to 7            $\frac{3}{7}$  

Help Me!

• Let's write the ratio of oranges to apples in three ways!

• 1) ___________

• 2) __________

• 3) __________

Multiple Choice

There are 14 boys and 12 girls in the class.

All of the following show the ratio of boys to girls correctly, EXCEPT...

• 14:12

• $\frac{14}{12}$

• 14 to 12

• 14-12

Fill in the Blanks

When Mrs. Belliveau is here, there are 2 teachers to 24 students in the class. We can write this as:

 $\frac{2}{24}$    or     2 to 24

What is the third way to write this ratio?

Goal 3: I know the difference between a part-to-part and a part-to-whole ratio

Multiple Select

If you have 2 green apples and 5 red apples, which of the following would be a part to part ratio? SELECT ALL THAT APPLY

• 2:5

• 2:7

• 5:2

• 7: 5

Multiple Choice

There are three red flowers, two pink flowers, and one yellow flower. Which of the following shows a part to whole ratio?

• 3 red flowers to 1 yellow flower

• 1 yellow flower to 2 pink flowers

• 3 red flowers to 2 pink flowers

• 2 pink flowers to 6 total flowers

Multiple Choice

We have 10 pepperoni pizzas

We also have 12 cheese pizzas.

Which of the following uses the correct ratio language for a PART to WHOLE ratio

• For every 10 pepperoni pizzas there are 12 cheese pizzas.

• For every 10 pepperoni pizzas there are 22 total pizzas

• For every 12 pepperoni pizzas there are 10 cheese pizzas

Poll

Learning Goal 1:

How do you feel about knowing the definition of a ratio?

• Not Great,

  I can't describe a ratio

• I Feel Ok,

  I can kinda explain it

• I Feel Great,

  I can explain the definition of a ratio!

Poll

Learning Goal 2:

I can name the 3 ways to write a ratio

• I do NOT know all three ways

• I get most of them, but I need more practice!

• I can DEFINITELY write a ratio in three different notations

Poll

Learning Goal 3:

I can use ratio language and I know the difference between a part-to-part and a part-to-whole ratio

• I had a lot of trouble with this!

• I feel good, but need more pracitce!

• I feel like this is easy!