Math Ratios Proportions

Approximately 4 out of 5 students in Mrs. Haynes 7th grade math class have cell phones. If there are 365 students in the 7th grade, how many would you expect to have a cell phone? Answer: _ student have cell phones

Mathematical Equivalence

ON

A 100-ounce jug of liquid laundry detergent

can wash 64 loads of laundry. How many

loads could a 150-ounce jug of detergent

wash?

Answer: _ loads of laundry

Mathematical Equivalence

ON

Solve.

x = _

Mathematical Equivalence

OFF

A map uses a scale of 2 centimeters = 4 miles. Mary’s drive to work is represented on the map as traveling 1 centimeter north, then 2.5 centimeters west. Which proportion could be used to determine the number of miles Mary drives to work?

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Do the ratios form a proportion?

• Yes, they form a proportion.

• No, they do not form a proportion.

Which is NOT equivalent to 3:5?

• 15:25

• 9:15

• 21:28

• 30:50

• x = 16

• x = 28

• x = 1/26

• x = 26

What is a proportion?

• When two ratios can be simplified

• When two ratios are equivalent and show the same value

• When two ratios have the exact same numbers

• When two ratios can be multiplied by 2

The ratio of soccer players to baseball players on two school teams is 4 to 7. Which of the following could be the number of players on each team?

• 12 soccer players and 15 baseball players

• 12 soccer players and 21 baseball players

• 16 soccer players and 19 baseball players

• 16 soccer players and 49 baseball players

Solve for x 

• x = 15

• x = 11

• x = 1/11

• x = 20