1. If the two objects below are proportional, find the value of x.
DO NOW
If the two objects below are proportional, find the value of x.

2. 4 32 10 5 We will compute1 unit rates. 1 8 2 1
Learning Objective
NAME____________________
We will compute1 unit rates.
CALIFORNIA STANDARDS: 7AF4.2 & 7MG1.3
Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured in like or different units.
What are we going to do?
What does compute mean?
Compute means __________.
CFU
Activate Prior Knowledge
A unit rate shows the relationship between a quantity and one unit of another quantity.
Unit Rates
Quantity B b 1 a
Quantity A
Use the ratio table to find the unit rate.
1. Vanessa ran 4 miles this morning in 32 minutes. Find her average time, in minutes, for every 1 mile.
miles 4 32
minutes 4 = 1
8 minutes per mile or
8 minutes for every 1 mile
Students, you already learned how to calculate unit rates. Now, we will compute unit rates with fraction quantities.
Make Connection 32 4 = 8
2. Edgar downloaded a 10-megabyte video in 5 seconds. What was the downloading rate in megabytes per second?
megabytes 10 5
seconds 10 5 = 2
2 megabytes per second 5 = 1
1 calculate
Vocabulary

3. 1½ cups of oats for each cup of granola
Concept Development
A unit rate shows the relationship between a quantity and one unit of another quantity.
The multiplicative inverse of the unit quantity can be used to find a unit rate.
Unit Rates
Quantity B b 1 a
Quantity A
Unit Rates
Aubrey’s cereal has ½ of a cup of granola for every ¾ of a cup of oats.
Which of the following are unit rates? How do you know?
A 6½ pounds for $10
B ⅔ of a mile per lap
C each container holds ⅝ of a gallon
In your own words, what is a unit rate. A unit rate is ______.
CFU
Cups Granola
Cups Oats 1 2 3 4 =
1½ cups of oats for each cup of granola
⅔ of a cup of granola for each cup of oats

4. Skill Development/Guided Practice
A unit rate shows the relationship between a quantity and one unit of another quantity.
The multiplicative inverse of the unit quantity can be used to find a unit rate.
Create an equivalent ratio table using the given units and quantities.
Identify the unit quantity. (write 1)
Determine2 the multiplicative inverse which produces 1.
Apply the multiplicative inverse to the other quantity.
Interpret3 the unit rate.
Compute unit rates. 1 2 3 5 4
How did I/you identify which would be the unit quantity?
How did I/you determine the other quantity.
CFU 2 4
Unit Rates
Quantity B b 1 a
Quantity A
1. In preparation for a hurricane, Ryan paid $24 for two-thirds of a ton of sand to make protective sand bags. If sand is priced at a flat rate, find the cost per ton of the sand.
____________________________________ ____________________________________
2. Madeline looked at her workout app during her bike ride. It measured that she had biked ¾ of a mile and burned 54 calories. On average, how many calories will she burn each mile? 3 4 24 1 3 2 = 3 4 4 3 = 1 24 36
dollars
miles 2 3 2 3 3 2 =
tons 1 54 54 1 4 3 = 72
calories
It will cost Ryan $36 per ton of sand.
On average, Madeline burns 72
calories every mile.
2 figure out 3 explain
Vocabulary

5. Skill Development/Guided Practice (continued)
A unit rate shows the relationship between a quantity and one unit of another quantity.
The multiplicative inverse of the unit quantity can be used to find a unit rate.
Create an equivalent ratio table using the given units and quantities.
Identify the unit quantity. (write 1)
Determine the multiplicative inverse which produces 1.
Apply the multiplicative inverse to the other quantity.
Interpret the unit rate.
Compute unit rates. 1 2 3 5 4
How did I/you identify which would be the unit quantity?
How did I/you determine the other quantity.
CFU 2 4
Unit Rates
Quantity B b 1 a
Quantity A
3. Every ½ cup of coconut flakes costs $0.20. How many cups of coconut flakes can you get for $1?
____________________________________ ____________________________________
4. If Howard hikes ⅔ mile in each ⅓ hour, compute the unit rate of miles hiked per hour. 1 2 2 3 1 2 10 2 = 2½ 2 3 3 1 = 2
cups
miles 2 10 1 3 2 10 10 2 = 1
hour 1 3 3 1 = 1
dollars
You can get 2½ cups of coconut
flakes per dollar.
Howard hikes 2 miles per hour.

6. Skill Development/Guided Practice (continued)
How did I/you determine what the question is asking?
How did I/you determine the math concept required?
How did I/you determine the relevant information?
How did I/you solve and interpret the problem?
How did I/you check the reasonableness of the answer?
CFU 2 1 3 4 5
5. Sean is comparing the prices of macadamia nuts at the store. One bag costs $5 per pound. Another bag cost $4 for ⅔ of a pound. Which option gives Sean a better price?
____________________________________ ____________________________________
6. Charles runs a mile in 9 minutes. Jessica can run ⅜ of a mile in 3 minutes. Who runs a faster mile? 3 8 3 8 8 3 = 1 4 4 1 3 2 = 6
dollars
miles 2 3 2 3 3 2 = 3 1 8 3 =
pounds 1
minutes 3 8
Buying the macadamia nuts at $5
per pound gives Sean a better price.
Jessica can run a mile faster than
Charles.

7. Relevance
A unit rate shows the relationship between a quantity and one unit of another quantity.
The multiplicative inverse of the unit quantity can be used to find a unit rate. 1
Computing unit rates will help you understand mixtures with fractional measures.
A salad dressing company makes a dressing with a mixture of 1/2 of a cup of vinegar for every 1 cup of oil. Using this unit rate, they can make 3-cup, 6-cup, 9-cup and 12-cup bottles.
Cups Vinegar
Cups Oil 1 2 1 2 2 4
(1.5 cups) (3 cups) (6 cups) (9 cups) (12 cups) 2
Computing unit rates will help you do well on tests.
Sample Test Question:
9. Abraham needed 250mg of ibuprofen to relieve a fever. He took 2 tablets. How many milligrams of ibuprofen are in each tablet?
Does anyone else have another reason why it is relevant to compute unit rates? (Pair-Share) Why is it relevant to compute unit rates? You may give one of my reasons or one of your own. Which reason is more relevant to you? Why?
CFU
Milligrams
Number of tablets
250 2

8. A unit rate shows the relationship between a quantity and one unit of another quantity.
The multiplicative inverse of the unit quantity can be used to find a unit rate.
Word Bank
Skill Closure
Create an equivalent ratio table using the given units and quantities.
Identify the unit quantity. (write 1)
Determine the multiplicative inverse which produces 1.
Apply the multiplicative inverse to the other quantity.
Interpret the unit rate.
Compute unit rates. 1 2 3 5 4
Unit Rates
Quantity B b 1 a
Quantity A
1. Filet Mignon (Premium Steak) costs $5 for every ¼ pound Find the cost per pound for the premium steak. 5 5 1 4 1 = 20
dollars 1 4 1 4 4 1 = 1
pound
____________________________________ ____________________________________
Premium steaks cost $20 per pound.
Word Bank
unit rates
unit quantities
multiplicative
inverse
one unit
Access Common Core
Explain how you used the ratio table to find the unit rate in the problem above.
To find the unit rate, I identified the unit quantity as pounds. Then I determined the multiplicative inverse that produced 1 and multiplied it to both quantities.
Summary Closure
What did you learn today about computing unit rates? (Pair-Share)
Use words from the word bank.

9. Create an equivalent ratio table using the given units and quantities.
Independent Practice
A unit rate shows the relationship between a quantity and one unit of another quantity.
The multiplicative inverse of the unit quantity can be used to find a unit rate.
Create an equivalent ratio table using the given units and quantities.
Identify the unit quantity. (write 1)
Determine the multiplicative inverse which produces 1.
Apply the multiplicative inverse to the other quantity.
Interpret the unit rate.
Compute unit rates. 1 2 3 5 4
Unit Rates
Quantity B b 1 a
Quantity A
1. The nutrition facts on the side of a popcorn box recommend a serving size of ⅓ cup, unpopped. This serving size yields 150 calories. Find the amount of calories in one cup of unpopped popcorn.
_____________________________________ _____________________________________
2. Meredith evenly spread fertilizer on her lawn.
It took 1⅓ bags of lawn fertilizer to cover her 100 ft2 lawn. At this rate, find the area of lawn one bag can fertilize.
3. Jessie’s flowers are the best in town. She attributes this to her homemade fertilizer. If Jessie uses ½ cup of cottonseed meal for every ¼ cup of phosphate, how much cottonseed would Jessie use per cup of phosphate?
4. A printer is printing hundreds of copies of a popular new book. The printer produces ⅔ of a book every ¼ hour. Find the rate of books printed per hour. 1 2 1 2 2 1 = 1 3 1 3 3 1 = 1
cups 1
bags
150
150 1 3 1 =
450
square feet
100
100 1 2 1 =
200
calories
There are 450 calories in 1 cup of unpopped popcorn.
One bag of fertilizer can cover
200 ft2 of lawn. 2 3 2 3 4 1 = 2 2 3 1 2 1 2 4 1 = 2
books
cottonseed
hours 1 4 1 4 4 1 = 1
phosphate 1 4 1 4 4 1 = 1
Jessie needs 2 cups of cottonseed per cup of phosphate.
In one hour, the printer will print two and two-third books.

10. There are 300 milligrams of acetaminophen in each tablet.
Periodic Review 1
1. Ricardo’s doctor recommended that he take 450 milligrams (mg) of acetaminophen every 6 hours for common illnesses. If Ricardo’s mom gave him 1½ tablets for the first dose, how many milligrams of acetaminophen are in each tablet?
_____________________________________ _____________________________________
2. Crystal runs 7 miles in ¼ of an hour. Find her speed in miles per hour.
There are 300 milligrams of acetaminophen in each tablet.
Crystal runs 7 miles per hour.
Access Common Core
Describe the process you used to solve the problems above.
To solve the problems above, I first identified the unit quantity. In problem #1 the unit quantity was 1 tablet. In problem #2 the unit quantity was 1 hour. Then I determined the multiplicative inverse that produced 1 in each problem. Using the multiplicative inverse, I multiplied the other quantity to find the unit rate.

11. One ounce of gold is worth $1,560.
Periodic Review 2
1. A one-tenth ounce gold coin is worth $156. What is the value of one ounce of gold?
_____________________________________
2. $1.25 buys 1/2 of a cup of dark chocolate chips. How much would 1 cup of dark chocolate chips cost?
One ounce of gold is worth $1,560.
1 cup of dark chocolate chips costs $2.50.
Access Common Core
Not all situations yield proportional relationships.
“If 1 person can paint a house in 3 hours, then 2 people can paint the same house in 6 hours.”
Explain why this statement may not be true.
“If Luke is 2 years old and Erin is 1 year old, then when Luke is 6, Erin will be 3 years old.”
This statement may not be true because increasing the number of people working should decrease the time it takes, not increase. It is not a proportional relationship.
This statement is not true because as time passes, Luke will always only be 1 year older than Erin. It is not a proportional relationship.

12. The ride will spin 12 times in 1 minute.
Periodic Review 3
1. A photo 6 inches tall by 4 inches long. How tall would the photo be if it was proportionally increased to be 12 inches long?
_____________________________________ _____________________________________
2. A carnival ride spins 3 times every ¼ minute. Find the number of spins per minute.
If the photo was increased to be 12 inches long, it would be 18 inches tall.
The ride will spin 12 times in 1 minute.
Access Common Core
1. If the photo in Problem # 1 is increased to be 48 inches long, how tall will the photo be?
2. If the carnival ride in Problem # 2 is 2 minutes long, how many times will the ride spin?
Explain how you used your previous answers to solve these problems.
If the photo is increased to be 48 inches long, it will be 72 inches tall.
If the carnival ride is increased to 2 minutes long, it will spin 24 times.
To solve the problems above, I used the unit rate from the original problem and multiplied each quantity in the rate by the same value.