Ratios Intro & Recap

Ratios Intro & Recap

What is a ratio?

• a comparison of amounts/quantities

• can be written three ways

Multiple Choice

What is the ratio of monkeys to bananas?

• 5:4

• 5:9

• 4:9

• 4:5

What are the three ways to write a ratio?

• with a colon

• with the word "to"

• as a fake fraction

• ratio of strawberries to pineapples

Multiple Select

What are three ways to write a ratio for the amount of dogs compared to the number of cats?

• 7:11

• 11:7

• 11 to 7

• 11/7

• 7 to 11

When working with ratios...

• order matters (use the order they are written in)

• the bigger number might come first--this is ok!

• pineapple to strawberries

• strawberries to pineapple

There are two types of ratios:

• part to part ratios compare two parts of something

• part to whole ratios compares one part to (or out of) the whole amount

Multiple Choice

What type of ratio does the scenario represent?

What is the ratio of pumpkins to broccoli?

• Part to Part, 5:2

• Part to Part, 2:5

• Part to Whole, 2:7

• Part to Whole, 5:7

Open Ended

What questions do you have about ratios so far?

Ratios can be simplified

• you can treat them like fake fractions

• look for common factors

• ratio of strawberries to pineapples

Multiple Choice

Express the following ratio in simplest form:

16:40

• 4:10

• 8:20

• 2:5

• 5:2

Are two ratios equivalent?

• look for multiplicative relationships

• make sure you keep the order the same

Multiple Choice

Which ratio is equivalent to 5 to 4

• 25 to 20

• 10 to 12

• 4 to 5

• 15 to 8

Multiple Choice

Are 4 : 5 and 8 : 15 equivalent ratios?

• Yes

• No

Multiple Choice

For a recipe, Brutus uses 4 cups of sugar for every 5 cups of flour. Which of the following show equivalent ratios for sugar to flour?

• 4/5=8/10 =12/15

• 4/5 = 5/6 = 6/7

• 4/5 = 3/4 = 2/3

• 4/5=8/15=16/45

Open Ended

What questions do you have about ratios so far?