Decimals,Fractions,!Percent’s,&!Ratio’s!...
Transcript of Decimals,Fractions,!Percent’s,&!Ratio’s!...
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Decimals, Fractions, Percent’s, & Ratio’s
Name: _____________________________
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Specific Learning Outcomes: 7.N.3 – Solve Problems involving percent from 1% to 100% Achievement Indicators:
p Express a percent as a decimal or a fraction. p Solve a problem that involves finding a percent. p Determine the answer to a percent problem where the answer
requires rounding, and explain why an appropriate answer is needed (e.g., total cost including taxes)
7.N.4 – Demonstrate an understanding of the relationship between repeating decimals and fractions, and terminating decimals and fractions. Achievement Indicators:
p Predict the decimal representation of a fraction using patterns (e.g. !
!!= 0.09; '
!!= 0.18; *
!!= ? etc.)
p Match a set of fractions to their decimal representations. p Sort a set of fractions as repeating or terminating decimals. p Express a fraction as a terminating or repeating decimal. p Express a terminating decimal as a fraction. p Provide an example where the decimal representation of a
fraction approximates its exact value.
Define the Following Key Terms: Fraction
Decimal Number
Denominator
Numerator
Percent
Ratio
Simplify
Rounding
Place Value
Terminating Decimals
Repeating Decimals
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Part 1: Converting Decimals to Fractions To convert decimals to fractions, follow these steps:
1. Write down the decimal divided by 1, like this: ,-./012
!
2. If there is one number after the decimal point, then multiply the top number (numerator) and bottom number (denominator) by 10; if there are two numbers, then use 100; if there are three numbers, then use 1000, etc.)
3. Simplify (or reduce) the fraction, if possible.
Example #1: Convert 0.75 into a fraction, and simplify if necessary.
0.751
0.75×1001×100
=75100
75 ÷ 25100 ÷ 25
=34
Example #2: Convert 1.050 into a fraction, and simplify if necessary.
1.0501
1.050×10001×1000
=10501000
10501000
= 150 ÷ 501000 ÷ 50
= 1120
Write the decimal divided by 1.
Multiply the top and bottom by 100. (Because there are two numbers following the decimal point.)
Simplify the fraction. GCF = 25.
Multiply the top and bottom by 1000. (Because there are three numbers following the decimal
point.)
Convert Improper Fraction to a Mixed Fraction and Simplify.
GCF = 50.
Write the decimal divided by 1.
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Practice: Convert the following decimal numbers into fractions. Write all improper fractions as Mixed Fractions. Simplify all fractions, if necessary.
A. 0.75
B. 0.03
C. 0.30
D. 0.85
E. 0.06
F. 3.8
G. 1.2
H. 2.1
I. 3.25
J. 10.15
K. 6.24
L. 5.05
M. 5.85
N. 2.3
O. 0.025
P. 0.005
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Part 2: Converting Fractions to Decimals To convert fraction to a decimal, simply divide the top number by the bottom number.
Example #1: What is :
; as a decimal?
58= 5 ÷ 8 = 0.625
Practice: A. Draw a line to match the following fractions with the correct decimal number.
1. !' A. 0.6
2. '!=
B. 0.3636…
3. >!!
C. 0..75
4. *> D. 0.2
5. '* E. 0.5
B. Sort the following decimal numbers.
0.5 0.333… 0.75 0.1111… 0.46 0.9 0.25 0.1
Terminating Decimals Repeating Decimals
C. Convert the following fractions in to decimal numbers.
1. '!==
2. :;=
3. !'=
4. !*!?=
5. ':=
6. @'=
7. ':!'=
8. !*=
9. *>=
10. :A=
Divide the top number by the bottom number. Use a calculator.
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Assignment #1: Decimals ó Fractions Convert each decimal into a fraction.
1. 0.8 = 2. 1.4 = 3. 0.7 = 4. 0.12 = 5. 6.4 =
6. 1.25 = 7. 6.5 = 8. 3.7 = 9. 2.2 = 10. 7.5 =
Convert each fraction into a decimal.
1. @A!==
2. ':!==
= 3. ?
:=
4. *A!==
5. !@'=
6. :*!==
7. !!!==
8. '*!==
= 9. A
'=
10. ;:=
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Part 3: Percent’s (%) A percent is a special type of fraction that compares a number out of 100. Let’s take a look at the meaning of the word “percent.”
“Per” means... ________________________ “Cent” means… _______________________
Percent means… _________________________________ The symbol for percent is… _____
How to Convert Decimals into Percent’s To convert a decimal to a percent, multiply the decimal by 100 and add a percent sign.
Example #1: Convert 0.75 to a percent.
0.75 × 100 = 75%
Practice: Convert the following decimal numbers in to percent’s.
A. 0.62 = ______________
B. 0.26 = ______________
C. 0.08 = ______________
D. 0.5 = ________________
E. 0.236 = _____________
F. 0.230 = _____________
G. 1.28 = ______________
H. 0.15 = ______________
I. 0.0369 = ____________
How to Convert Percent’s into Decimals To convert a percent to a decimal, divide the percent by 100, and remove the percent sign.
Example #2: Convert 75% to a decimal.
75% ÷ 100 = 0.75
Practice: Convert the following percent’s into decimal numbers.
A. 14% = ______________
B. 3% = ______________
C. 436% = _____________
D. 64% = ______________
E. 54.3% = ____________
F. 20.5% = ____________
G. 48% = ______________
H. 100% = _____________
I. 0.9% = ____________
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How to Convert a Fraction into a Percent To convert a fraction into a percent, follow these steps.
1. Convert the fraction into a decimal using one of the three methods discussed in class. (Place value, long division, or calculator).
2. Multiple the decimal by 100, and add a % sign.
Example #3 Convert
*> in to a percent.
34= 3 ÷ 4 = 0.75
0.75 ×100 = 75%
Practice: (Round all percent’s to the nearest tenth)
1. @!=
2. ';!==
3. !'=
4. **>:
5. !*':
6. !'*AA
Divide the top number by the bottom number. Use a calculator.
Multiply the decimal by 100, and add a % sign.
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Assignment #2: Decimals ó Percents Convert each decimal into a percent.
1. 0.12 = 2. 0.05 = 3. 0.9 = 4. 1.12 = 5. 0.11 =
6. 0.4 = 7. 0.37 = 8. 1.5 = 9. 0.03 = 10. 1.3 =
Convert each percent into a decimal.
1. 25% = 2. 4% = 3. 13% = 4. 46% = 5. 59% =
6. 33% = 7. 32% = 8. 8% = 9. 28% = 10. 15% =
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Assignment #3: Fractions ó Percents Convert each fraction into a percent.
1. !!==
2. !!':=
3. '*:==
4. @!==
5. *>=
6. !'':=
7. >:=
8. @:==
9. A'==
10. ;:=
Convert each percent into a fraction.
1. 17% = 2. 49% = 3. 52% = 4. 33% = 5. 31% =
6. 28% = 7. 2% = 8. 40% = 9. 75% = 10. 50% =
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Part 4: Ratios Ratios are used to make comparisons between two things.
For example, the “student to teacher ratio” in class today is….
# of Students to # of teachers = ________ to _________
There are 3 different ways to express (write) ratio.
Use a colon (:) With “to” As a fraction 1:4 1 to 4 1/4
2/11
8 to 10
3:6
6/5
Practice: You have baked a batch of cookies, provide the following ratios for your batch. For each question express the ratio in all three ways and reduce where possible
1. Compare the number of white cookies to the number of chocolate chip cookies.
2. Compare the number of dark chocolate cookies to the number of chocolate chip cookies.
3. Compare the number of dark and white chocolate cookies to the number of chocolate chip cookies.
4. Compare the number of dark chocolate cookies to the number of white chocolate cookies.
5. Compare the number of chocolate chip cookies to the total number of cookies.
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How to Find the Percent of a Number
Example #1 What is 10% of 10?
1. Convert the percent to a decimal. 10% ÷ 100 = 0.10 2. Multiple the decimal by the number given. 0.10×10 = 1
Practice: 1. What is 15% of 60?
2. What is 40% of 24?
3. What is 150% of 22?
4. What is 25% of 40?
5. What is 0.5% of 2,500?
6. What is 300% of 12?
Part 6: Problem Solving If the price of a sweater is $40.00, find the amount of PST (7%) and GST (6%) that will be added, then calculate the final price.
The regular price of the dog food is $5.00, however there is a sale and the price has been reduced by 20%. How much do you save? What is the sale price?
CHALLENGE: The regular price of a t-‐shirt is $25.00, however there is a sale and the price has been reduced by 10%. What is the new sale price after taxes (PST 7% and GST 6%)?