Rates and Compare Rates Math

Can I compare rates that have different denominators?

• No, you need a common denominator to be sure

• Yes, it doesn't matter

Which of the following are unit rates? (HINT: there's more than one)

• 255 people per 3 rooms

• $2.51 per watermelon

• 65 miles / 1 hour

• 321 gallons / 3 tanks

For a unit rate, what number should the denominator be?

• 2

• 10

• Doesn't matter

• 1

What are two ways we have seen to find a unit rate?

• Adding the same number to the top & bottom

• Divide the whole rate by the bottom number

• Using a double number line

• Multiplying or dividing the bottom number only

A unit rate is a rate or ratio with....

• a denominator of 1

• a rate with a 1 somewhere in it?

• the whole rate is 1/1

• a denominator of any number

If I multiply or divide two rates by the same number, does that change whether one rate is greater or less than the other?

• Yes

• No

Alan bought 5 pairs of socks for $15. How much was each pair of socks?

• $5 per sock pair

• $3 per socks pair

• $2 per sock pair

• $1 per sock pair

Miranda is buying yarn so she can crochet scarves for her family. She likes the Fluffy Fibers brand best. At the store, she finds a 7-ounce roll of Fluffy Fibers yarn for $8.33 and a 16-ounce roll for $18.72. Which size roll is the better value?

• 7-ounce

• 16-ounce

Answer explanation

Janelle wants to learn to play the piano. Her friends recommended two different music schools. Make Music charges $525 for 10 hours of lessons. Piano Play offers 12 hours of lessons for $540.

Which school offers the better deal?

• Make Music

• Play Piano

Answer explanation

Ben and Corinne are filling goodie bags for a party. Each goodie bag needs an eraser, a bubble wand, and a few candy bar bites. Ben filled 25 goodie bags in 20 minutes. Corinne filled 27 goodie bags in 24 minutes. Who filled goodie bags at a faster pace?

• Ben

• Corinne

Answer explanation