1. Warm Up
Problem of the Day
Lesson Presentation
Lesson Quizzes

2. Warm Up
Write each fraction in simplest terms. 1. 36 40 9 10 21 35 3 5 2. 8 12 2 3 42 90 7 15 3. 4. 15 80 3 16 56 84 2 3 5. 6.

3. Problem of the Day
If June 1 falls on a Tuesday, on which day of the week does September 1 fall?
Wednesday

4. Sunshine State Standards
Prep for MA.7.A.1.1 Distinguish between situations that are proportional or not proportional and use proportions to solve problems.
Review of MA.6.A.2.2

5. Vocabulary
ratio

6. In basketball practice. Kathlene made 17 baskets in 25 attempts
In basketball practice. Kathlene made 17 baskets in 25 attempts. She compared the number of baskets she made to the total number of attempts she made by using the
ratio A ratio is a comparison of two
quantities by division. 17 25
Kathlene can write her ratio of baskets made
to attempts in three different ways. 17 25
17 to 25
17:25

7. Additional Example 1: Writing Ratios
Twenty students are asked to choose their favorite music category. Eight chose pop, seven chose hip hop, and five chose rock. Write each ratio in all three forms.
A. rock to hip hop
The ratio of rock to hip hop is 5 to 7, which can be written as follows: 5 7
, 5 to 7, 5:7
B. hip hop to pop
The ratio of hip hop to pop is 7 to 8, which can be written as follows: 7 8
, 7 to 8, 7:8

8. Additional Example 1: Writing Ratios
Twenty students are asked to choose their favorite music category. Eight chose pop, seven chose hip hop, and five chose rock. Write each ratio in all three forms.
C. rock to pop and hip hop
The ratio of rock to pop is 5 to 8 and rock to hip hop is 5 to 7, which can be written as follows: 5 15
, 5 to 15, 5:15

9. Check It Out: Example 1
Nineteen students are asked to choose their favorite sport. Nine chose rock climbing, four chose kite surfing, and six chose snow boarding. Write each ratio in all three forms.
A. snow boarding to rock climbing
The ratio of snow boarding to rock climbing is 6 to 9, which can be written as follows: 6 9
, 6 to 9, 6:9
B. kite surfing to snow boarding
The ratio of kite surfing to snow boarding is 4 to 6, which can be written as follows: 4 6
, 4 to 6, 4:6

10. Check It Out: Example 1
Nineteen students are asked to choose their favorite sport. Nine chose rock climbing, four chose kite surfing, and six chose snow boarding. Write each ratio in all three forms.
C. rock climbing to kite surfing and snowboarding
The ratio of rock climbing to kite surfing is 9 to 4 and rock climbing to snow boarding is 9 to 6, which can be written as follows: 9 10
, 9 to 10, 9:10

11. Sometimes a ratio can be simplified
Sometimes a ratio can be simplified. To simplify a ratio, first write it in fraction form and then simplify the fraction.

12. A fraction is in simplest form when the GCF of the numerator and denominator is 1.
Remember!

13. Additional Example 2: Writing Ratios in Simplest Form
On average, most people can read about 600 words in 3 minutes. Write the ratio of words to minutes in all three forms. Write your answer in simplest form.
words
minute
600 3 =
Write the ratio as a fraction.
words
minute
600 ÷ 3
3 ÷ 3 =
Simplify.
words
minute
200 1
For every minute, there are 200 words read. =
The ratio of words to minutes is 200 to 1.

14. Check It Out: Example 2
At Casitas Middle School there are 456 microscopes for 152 students. Write the ratio of microscopes to students in all three forms. Write your answer in simplest form.
microscopes
students
456
152
Write the ratio as a fraction. =
microscope
students
456 ÷ 152
152 ÷ 152 =
Simplify.
microscope
students 3 1
For every microscope, there are 3 children. =
The ratio of microscopes to students is 3 to 1.

15. To compare ratios, write them as fractions with common denominators
To compare ratios, write them as fractions with common denominators. Then compare the numerators.

16. Additional Example 3: Comparing Ratios
Honey lemon cough drops come in packages of 30 drops per 10-ounce bag. Cherry cough drops come in packages of 24 drops per 6-ounce bag. Tell which package has the greater ratio of drops to ounces. 6 10
Ounces 24 30
Drops
Cherry
Honey lemon
drops
ounces 30 10 3 1 =
Write the ratios as fractions with common denominators.
Honey lemon: =
drops
ounces 24 6 4 1
Cherry: = =
Because 4 > 3 and the denominators are the same, the drops to ounces is greater in the bag of cherry cough drops.

17. Check It Out: Example 3
Jelly beans come in small packages of 25 per 5 ounce package and large packages of 56 per 8 ounce package. Tell which package has the greater ratio of jelly beans to ounces. 5 8
Ounces 25 56
Jelly beans
Small
Large
jelly beans
ounces 56 8 7 1 =
Write the ratios as fractions with common denominators.
Large: =
jelly beans
ounces 25 5 5 1
Small: = =
Because 7 > 5 and the denominators are the same, jelly beans to ounces is greater in the small package.

18. Lesson Quizzes
Standard Lesson Quiz
Lesson Quiz for Student Response Systems

19. Lesson Quiz: Part I
A coin bank contains 16 quarters, 12 dimes, and 8 nickels. Write the given ratio in all three forms.
1. nickels to quarters
2. dimes to nickels
3. nickels and dimes to quarters 8 16
, 8 to 16, 8:16 or 1 2
, 1 to 2, 1:2 12 8
, 12 to 8, 12:8 or 3 2
, 3 to 2, 3:2 20 16
, 20 to 16, 20:16 or 5 4
, 5 to 4, 5:4

20. Lesson Quiz: Part II
4. There are 220 calories in 5 crackers. Write the ratio of calories to crackers in all three forms. Write your answers in simplest form.
5. On a school trip, bus 1 has 3 teachers and 14 students. Bus 2 has 4 teachers and 28 students. Which bus has the greater ratio of teachers to students?
44 calories
1 cracker
, 44 to 1, 44:1
bus 1

21. Lesson Quiz for Student Response Systems
1. A box contains 18 violet tops, 15 red tops, and 6 white tops. Identify the ratio of white tops to violet tops in all three forms.
A. , 6 to 18, 6:18 or , 1 to 3, 1:3
B. , 6 to 15, 6:15 or , 2 to 5, 2:5
C. , 6 to 18, 6:18 or , 2 to 5, 2:5
6 18
1 3
6 15
2 5
6 18
2 5

22. Lesson Quiz for Student Response Systems
2. A box contains 15 black pens, 12 blue pens, and 9 white pens. Identify the ratio of black pens to white pens in all three forms.
A. , 12 to 9, 12:9 or , 4 to 3, 4:3
B. , 15 to 9, 15:9 or , 5 to 3, 5:3
C. , 12 to 9, 12:9 or , 5 to 3, 5:3
12 9
4 3
15 9
5 3
12 9
5 3

23. Lesson Quiz for Student Response Systems
3. In a book shelf, there are 20 math books, 14 science books, and 2 history books. Identify the ratio of history books and science books to math books in all three forms.
A. , 16 to 20, 16:20 or , 7 to 10, 7:10
B. , 14 to 20, 14:20 or , 4 to 5, 4:5
C. , 16 to 20, 16:20 or , 4 to 5, 4:5
16 20
7 10
14 20
4 5
16 20
4 5

24. Lesson Quiz for Student Response Systems
4. In a school, there are 350 students in 5 classes. Identify the ratio of students to classes in all three forms. Write your answers in simplest form.
A , 70 to 1, 70:1 C , 70 to 4, 70:4
B , 4 to 70, 4:70 D , 1 to 70, 1:70
70 1
70 4
70 4
70 1

25. Lesson Quiz for Student Response Systems
5. In Family 1, there are 6 adults and 14 children. Which of the following families will have a greater ratio of adults to children than Family 1?
A. Family 2: 9 adults and 19 children
B. Family 3: 3 adults and 10 children
C. Family 4: 4 adults and 12 children
D. Family 5: 7 adults and 18 children