Introduction to Ratios

What is a Ratio?

• Is a comparison of two quantities

• To multiply two fractions

• Strictly a fraction

• Two decimals that can be multiplied

If there are 5 boys and 7 girls, write the ratio of girls to boys.

• 5 to 7
• 7 to 5
• 5 to 12
• 7 to 12

A bag of marbles comes with 3 blue marbles, 2 red marbles, and 5 yellow marbles. What is the ratio of red to yellow?

• 2 to 5
• 5 to 3
• 3 to 5
• 5 to 2

In the fruit bowl there are 4 apples, 2 bananas, and 5 pears.  What is the ratio of pears to ALL fruit?

• 5:4
• 5:11
• 2:5
• 6:5

Which represents the relationship of oranges to fruit?

• 2:6
• 2:4
• 4:6
• 4:2

Tell if the ratio is part-to-part or part-to-whole.
4 apples to 3 oranges

• Part-to-Part
• Part-to-Whole

Tell if the ratio is part-to-part or part-to-whole.
In a a mini bag of M&Ms, there are 16 M&Ms and 5 of them are red.

• Part-to-Part
• Part-to-Whole

3 ways to write a ratio is.....

• read, write, demonstration
• to solve
• using to, using a colon, and as a fraction
• very important

How many different ways can you write a ratio

• 1
• 2
• 3
• 4

A ratio can be written as all the ways below EXCEPT which one?

• 3=4

• 3:4

• 3 to 4