Embed Size (px)
Citation preview
Five-Minute Check (over Chapter 1)
Main Idea and Vocabulary
Key Concepts: Rational Numbers
Example 1:Write a Fraction as a Decimal
Example 2:Write a Repeating Decimal
Example 3:Real-World Example: Round a Repeating Decimal
Example 4:Write a Decimal as a Fraction
Example 5: Write a Decimal as a Fraction
• rational number
• terminating decimal
• repeating decimal
• bar notation
• Express rational numbers as decimals and decimals as fractions.
Write a Fraction as a Decimal
Write as a decimal.
0
–160
.1
–128
8
0–112
75
14
12
80–80
0
Divide 3 by 16.
Answer: 0.1875
1. A
2. B
3. C
4. D0% 0%0%0%
A. 0.0515
B. 0.0625
C. 0.0875
D. 0.16
Write a Repeating Decimal
You can divide as shown in Example 1 or use a calculator.
Answer:
–35 11 –3.18181818ENTER÷
1. A
2. B
3. C
4. D0% 0%0%0%
A. 5.1
B. 5.15
C. 5.2
D. 5.9
AGRICULTURE A farmer lost the fruit on 8 of 15 orange trees because of unexpected freezing temperatures. Find the fraction of the orange trees that did not produce fruit. Express your answer as a decimal rounded to the nearest thousandth.
To find the fraction of trees that did not produce fruit, divide the number of lost trees, 8, by the total number of trees, 15.
Round a Repeating Decimal
8 15 0.5333333333ENTER÷
Look at the digit to the right of the thousandths place. Round down since 3 < 5.
Answer: The fraction of fruit trees that did not produce fruit was 0.533.
Round a Repeating Decimal
1. A
2. B
3. C
4. D0% 0%0%0%
A. 0.094
B. 0.148
C. 0.182
D. 0.252
SCHOOL In Mrs. Townley’s eighth grade science class, 4 out of 22 students did not turn in their homework. Find the fraction of the students who did not turn in their homework. Express your answer as a decimal rounded to the nearest thousandth.
Write 0.32 as a fraction.
0.32 is 32 hundredths.
Write a Decimal as a Fraction
Simplify.
Answer:
1. A
2. B
3. C
4. D0% 0%0%0%
Write 0.16 as a fraction.
A.
B.
C.
D.
Write a Decimal as a Fraction
ALGEBRA Write 2.7 as a mixed number.
Multiply N by 10 because 1 digit repeats.
Let N = 2.7 or 2.777... . Then 10N = 27.777... .
Subtract N = 2.777... to eliminate the repeating part, 0.777... .
Divide each side by 9.
Write a Decimal as a Fraction
Answer:
9N = 25 10N – 1N = 9N
10N = 27.777...–1N = 2.777...
Simplify.
1. A
2. B
3. C
4. D0% 0%0%0%
ALGEBRA Write 1.7 as a mixed number.
A.
B.
C.
D.
End of the Lesson
Five-Minute Check (over Chapter 1)
Image Bank
Math Tools
Multiplying Fractions
Multiplying and Dividing Fractions
1. A
2. B
3. C
4. D0% 0%0%0%
A. 22
B. 25
C. 42
D. 50
Evaluate 8 + (20 – 3)(2).
(over Chapter 1)
1. A
2. B
3. C
4. D0% 0%0%0%
A. 25
B. 7
C. –7
D. –25
Evaluate 16 + (–9).
(over Chapter 1)
1. A
2. B
3. C
4. D0% 0%0%0%
A. 17
B. 3
C. –3
D. –17
Evaluate –7 – 10.
(over Chapter 1)
1. A
2. B
3. C
4. D0% 0%0%0%
A. 90
B. 19
C. –19
D. –90
(over Chapter 1)
1. A
2. B
3. C
4. D0% 0%0%0%
A. 40
B. 10
C. –10
D. –40
(over Chapter 1)
Solve the equation Then check your solution.
1. A
2. B
3. C
4. D
0% 0%0%0%
A. 344
B. 2,150
C. 340
D. 443
Yasmine earns $0.25 for each cup of lemonade she sells. She earned $86 last Thursday selling lemonade. How many cups of lemonade did she sell last Thursday?
(over Chapter 1)
