Unit Rates

You are buying carrots. Your options are: a 3​-pound bag for ​$4.20 or a 10​-pound bag for ​$6.30​? Explain when a wiser purchase may NOT be the better buy.

• When you will only consume the 3 pounds of carrots and the rest will spoil.

• It might not be a wiser purchase if you plan to eat more than 10 lb of carrots.

• It might not be a wiser purchase because unit price does not always give the lowest price per item.

• It is always best to get the items with the lowest unit price.

On​ Tuesday, it snowed 15 inches in 6 hours. What is the unit rate?

• 6 hours per inch

• 15 inches per hour

• 2.5 hours per inch

• 2.5 inches per hour

30 books for ​$1,020. What is the unit price?

• $34 per book

• 34 books per dollar

• $.03 per book

• 30 books per dollar

$76 for 5 skirts. What is the unit price?

• 15.20 skirts per dollar

• $15.20 per skirt

• $76 per skirt

• 5 skirts per dollar

​$304 for 160 m² of carpet. What is the unit rate?

• $304 per m²

• 1.90 m ² per dollar

• $1.90 per m²

• 160 m² per dollar

• a
• b
• c
• d

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

Four pounds of bananas cost $6.  What is the cost per pound of bananas?

• $24 per pound

• $1.50 per pound

• $1 per pound

• $6 per pound

Alycia earned $20.40 in 3 hours. What is her unit rate in dollars per hour?

• $7 per hour

• $6 per hour

• $6.80 per hour

• $17.40 per hour

If Justin can type 408 words in 4 minutes, how many words can he type per minute?

• 102 words per minute

• 100 words per minute

• 400 words per minute

• 412 words per minute