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3. Express ratios and rates in fraction form
Objective
Express ratios and rates in fraction form
Example 1-3b

4. A comparison of two numbers by division
Vocabulary
Ratio
A comparison of two numbers by division
3 to 4
3:4 3 4
Example 1-3b

5. Ratios that have the same value
Vocabulary
Equivalent ratios
Ratios that have the same value
Example 1-3b

6. A ratio of two measurements having different units
Vocabulary
Rate
A ratio of two measurements having different units
Example 1-3b

7. A rate that has a denominator of 1
Vocabulary
Unit rate
A rate that has a denominator of 1
Example 1-3b

8. Example 1 Write a Ratio in Simplest Form
Example 2 Use Ratios to Compare Parts of a Whole
Example 3 Find Unit Rate
Lesson 1 Contents

9. Apples are listed first so will be the numerator
FRUIT Write the ratio that compares the number of apples to the number of oranges.
apples
Set up ratio
oranges
Apples are listed first so will be the numerator
Oranges listed second so will be denominator
1/3
Example 1-1b

10. Count how many apples and put in numerator
FRUIT Write the ratio that compares the number of apples to the number of oranges.
apples 8
 2
oranges 6
 2
Count how many apples and put in numerator
apples
Count how many oranges and put in the denominator
Answer:
oranges
Find GCF
= 2
NOTE: Leave ratio in fraction form
Divide GCF into numerator and denominator
1/3
Example 1-1b

11. RECREATION Write the ratio that compares the number of unicycles to the number of scooters.
Answer:
scooters
1/3
Example 1-1a

12. Sports books are listed first so will be the numerator
BOOKS Write the ratio that compares the number of books about sports to the total number of books.
Set up ratio
Sports books are listed first so will be the numerator
Total books are listed second so will be the denominator
2/3
Example 1-2a

13. Count how many sports books and put in numerator
BOOKS Write the ratio that compares the number of books about sports to the total number of books.
Count how many sports books and put in numerator
sports
Count how many total books and put in denominator
Answer:
total
Find GCF
= 1
2/3
Example 1-2a

14. SPORTS Write the ratio that compares the number of basketballs to the total number of sports balls.
Answer:
total
2/3
Example 1-2b

15. Money MUST be in the numerator
FOOD Find the cost per ounce of a 16-ounce jar of salsa that costs $2.88.
Set up ratio
cost
ounce
Money MUST be in the numerator
Cost is listed first so will be the numerator
Ounce is listed second so will be the denominator
3/3
Example 1-3a

16. Replace ounce with 16 ounce
FOOD Find the cost per ounce of a 16-ounce jar of salsa that costs $2.88.
Replace cost with $2.88
cost
ounce
Replace ounce with 16 ounce
3/3
Example 1-3a

17. Replace ounce with 16 ounce
FOOD Find the cost per ounce of a 16-ounce jar of salsa that costs $2.88.
 16
Replace cost with $2.88
cost
ounce
 16
Replace ounce with 16 ounce
“Cost per ounce” refers to a unit price
Answer:
Divide numerator AND denominator by denominator
3/3
Example 1-3a

18. *
TEMPERATURE The outside temperature rises 32 degrees in four hours. Find the temperature increase for one hour.
Answer:
3/3
Example 1-3b

19. Assignment
Lesson 10:1
Ratios
All
End of Lesson 1