​What is a ratio?

​A way to show the comparison/relationship between two numbers.

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​There are 3 kinds of ratios

​part to part

​part to whole

​whole to part

​How do I write a ratio?

​Use a colon : to separate the two values

​Use the words to or out of to separate the two values.

​Use the / to separate the two values (like a fraction)

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​The order in which you write the ratios matters.

​What's the ratio?

​How many boys are there? 15

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​How many girls are there? 10

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​What's the ratio of boys to girls?

15 to 10

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​Simplify your answer!

(Common factor is 5)

​3 : 2

​What's the ratio?

​How many boys are there? 15

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​What's the total? 25

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​What's the ratio of boys to girls?

15 to 25

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​Simplify your answer!

(Common factor is 5)

​3 : 5

​Rate

​A special type of ratio that compares 2 different types of units.

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​Examples:

​miles to hours

​dollars to pizza

​books : months

​points : game

​Unit Rate

​A rate with a denominator of 1

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​Examples:

​miles per hour (60 mi per hour)

​$ per pizza ($18 per pizza)

​books each month (3 books each month)

​points each game (20 pts per game)

​Example a

​How many laps can Izzy drive per minute?

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​Draw a ratio table. (laps over minutes)

​Example b

​How many minutes does it take Izzy to drive 1 lap?

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​Draw a ratio table minutes over laps.

​How do I find the unit rate ?

• ​Create/find the ratio.

• ​Divide or Simplify to get a denominator of 1.

• ​Write your answer as a rate including the labels.