Ratios

Ratios

What is a ratio?

• A ratio is a comparison of two things

• You can compare:

• items to each other (ex. A) ,

• to the whole set (ex. B)

• What are two things that you can compare in a classroom? Park? Store?

• ex. A # of girls to boys

• ex. B # of girls to entire class

• 1 red to 2 green

• 2 green to 8 total

Guided Practice

• What is the ratio of apples to pears?

• ¿Cuál es la razón de manzanas a peras?

• What is the ratio of pears to apples?

• ¿Cuál es la razón de peras a manzanas ?

• What is the ratio of apples to fruits?

• ¿Cuál es la proporción de manzanas a fruta?

• What is the ratio of pears to fruit?

​36 total dots
4 green
5 yellow
5 orange
4 red
5 pink
5 purple
4 Light blue
4 blue

Fill in the Blanks

Fill in the Blanks

Multiple Choice

A donut shop made 24 donuts with frosting and 26 donuts without frosting. What is the ratio of the number of donuts without frosting to the number of donuts with frosting?

• 24:50

• 26:50

• 26:24

• 24:26

Multiple Choice

The space program has 29 astronauts in outer space and 8 astronauts on Earth. What is the ratio of the number of astronauts in outer space to the total number of astronauts?

• 13:37

• 8:37

• 37:8

• 29:37

Poll

How do you feel about ratios?

• I don't understand

• I need more practice

• I'm good at this

Multiple Select

If there are 7 girls and 8 boys on the school’s track team, what is the ratio of girls to boys? Write your answer in three different ways.

• 7:8

• 8:7

• 8 to 7

• 7 to 8

• $$\frac{7}{8}$$

Multiple Select

If a sports field is 100 meters long and 40 meters wide, what is the ratio of its width to its length? Write your answer in three different ways.

• 100:40

• 40:100

• 40 to 100

• 100 to 40

• $$\frac{40}{100}$$

Multiple Choice

There are 20 seats and 18 students. What is the ratio of seats to students?

• 20:38

• 20:18

• 18:20

• 18:38

Multiple Choice

There are 20 kids and 18 teachers. What is the ratio of kids to total number of people?

• 20:18

• 20:48

• 20:38

• 18:20