Introduction to Ratios

What is a Ratio?

• A fraction only

• Is a comparison of two quanitities

• All items added together

• Decimals

What are the three ways to write a ratio?

What is the ratio of orange to green marbles if there are 15 orange marbles and 5 green marbles?

• 3:1

• 5:5

• 1:3

• 3:2

Mrs. Troupe makes a bracelet with 10 beads. 3 White. 2 Black, and 5 Red. The ratio of black to red beads is?

• 5:2

• 3:2

• 2:5

• 1:3

Mrs. Troupe makes a bracelet with 10 beads. 3 White. 2 Black, and 5 Red. The ratio of white to total beads?

• 5:10

• 6:2

• 5:2

• 3:10

True or False order matters when writing ratios?

How many ways can you write a ratio?

• 5

• 4

• 3

• 2

A ratio is a comparison between two quantities

• 4 Tacos, 3 Pizzas, 6 hamburgers

• Find the ratio of tacos to pizza.

A bar graph shows that 5 people like chocolate ice cream and 75 people like vanilla. What is the ratio of chocolate lovers to vanilla lovers?

• 1:15

• 3:5

• 15:1

• 5:3

If the ratio of pencils to pens in a box is 4:5 and there are 20 pencils, how many pens are there?

• 10

• 15

• 25

• 40