Ratios and Rates

88 students for 4 classes
How many students per class?

• 22 students per class
• 22 classes per student
• 25 students per class
• 25 classes per student

What is a Ratio?

• Is a comparison of two quantities 
• A rate with a denominator of one
• It is when the only factor the numerator and denominator share is a one 
• Two decimals that can be multiplied

Jose swims 3 laps in a pool every 2 minutes. How long would it take him to swim 27 laps?

• 8 minutes
• 9 minutes
• 16 minutes
• 18 minutes

How many ways can you write a ratio

• 1
• 3
• 2
• 4

Which ratio is written incorrectly?

• X : Y
• X and Y
• X/Y
• X to Y

A rate where the denominator is 1.

• Fraction

• Rate

• Unit Rate

• Ratio

Which of the following is NOT a unit rate?

• 4 dogs

  1 yard

• 0.3 miles

  1 minute

• 1 minute

  3 feet

• 0.75 hour

  1 game

You spend $40 on 5 pounds of concrete. What is the unit rate in dollars per pound?

• $8 per pound
• $5 per pound
• $35 per pound
• 0.125 pounds per dollar

A 7-pack of DVDs costs $23.31. What is the unit price?

• $3.33 per DVD
• $3.03 per DVD
• $2.33 per DVD
• $3.23 per DVD

What is the ratio to the picture shown, triangles to squares?

• 2:6
• 5:6
• 3:4
• 4:3