Ratio, Proportion, and Percents

In Derek's class, 18 of the 25 students belong to an after-school club. Which of the following percentages describes the students in an after-school club?

• 18%

• 25%

• 72%

• 43%

A pet store has 8 dogs, 12 turtles, and 3 cats. What does the ratio 8:23 compare?

• cats to turtles

• dogs to all animals

• dogs to cats

• turtles to all animals

Write the following ratio as a fraction in simplest form: 15 carnations out of 24 flowers

• 15/24

• 5/8

• 3/4

• 3/8

A ratio comparing a number to 100

• Percent

• Rate

• Proportion

• Fraction

What is a ratio?

• A comparison of two numbers by division.

• A number compared to 1.

• A number out of 100

• 65.8

Percents are...

• Part-to-Whole

• Part-to-Part

• Whole-to-Whole

• Salsa-to-Chips

How do you convert a percent to a fraction?

• Put the percent amount over 100 and simplify

• Move the decimal point two spots to the left

• Move the decimal point two spots to the right

• Divide by "putting the top number in the house"

How do you convert a decimal to a percent?

• Put the percent amount over 100 and simplify

• Move the decimal point two spots to the left

• Move the decimal point two spots to the right

• Divide by "putting the top number in the house"

How do you convert a percent to decimal?

• Put the percent amount over 100 and simplify

• Move the decimal point two spots to the left

• Move the decimal point two spots to the right

• Divide by "putting the top number in the house"

How do you convert a fraction to a percent?

• Divide

• Set up a proportion

• Combine the numbers

• Slap a percent sign on the top numerator