% and the basic percent equation
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% and the BASIC PERCENT EQUATION. MSJC ~ Menifee Valley Campus Math Center Workshop Series Janice Levasseur. % Percents %. Percent means “parts of 100” or “per 100” A percent can be written using a percent sign (%), as a fraction, or as a decimal. Converting a % to a Fraction. - PowerPoint PPT PresentationTRANSCRIPT
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% and the BASIC PERCENT
EQUATION
MSJC ~ Menifee Valley Campus
Math Center Workshop SeriesJanice Levasseur
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% Percents %
• Percent means “parts of 100” or “per 100”• A percent can be written using a percent
sign (%), as a fraction, or as a decimal
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Converting a % to a Fraction• To convert a percent to a fraction,
translate the % symbol:• Remove the % sign and divide by 100
(“per 100”)
Ex: Convert 27% to a fraction
27%10027
Simplify ? No . . . done
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Ex: Convert 25% to a fraction
25%10025
Simplify? YES!
41 Simplify? No . . .
done
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Ex: Convert 130% to a fraction130%
100130
100301
1031
Simplify? Yes! Improper Fraction
Simplify? Yes!
Simplify? No . . . done
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Ex: Convert % to a fraction31
10031
10031
1100
31
1001
31
3001 Simplify? No . . .
done
Divide fractions
%31
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Ex: Convert 0.5% to a fraction0.5%
10050. Divide decimals?
Decimal Fraction
10021
1100
21
1001
21
2001
Simplify? No . . . done
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Your Turn to Try a Few
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Converting a % to a Decimal
• To convert a percent to a decimal, translate the % symbol:
• Remove the % sign and divide by 100 (“per 100”) or
• Move the decimal point two places to the left
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Ex: Convert 27% to a decimal
27% = 27 100 27.0 = 0.27
Ex: Convert 25% to a decimal
25% = 25 100 25.0 = 0.25
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Ex: Convert 130% to a decimal
130% = 130 100 130.0= 1.30
Ex: Convert 0.5% to a decimal
0.5% = 0.5 100 0.5 = 0.005
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Ex: Convert % to a decimal31
• We are starting with a percent written as a fractional percent
• First convert the fractional percent to a fraction (drop the % sign and divide by 100)
10031
1001
31
3001
Fraction form of the answer
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Ex: cont. • Recall: To convert a fraction to a decimal number, divide the numerator by the denominator
3001 .0033
300 1.0000
900
1000
900
100
0.003
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Your Turn to Try a Few
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Converting a Fraction to a %
• To convert a fraction to a percent, reverse the procedure for converting a percent to a fraction:
• Multiply by 100 and add the % sign
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Ex: Convert ¼ to a percent
41 %100 %
1100
41
%4100 Simplify? Yes!
= 25%
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Ex: Convert 1 ½ to a percent
211 %100 %
1100
23
%2300 Simplify? Yes!
= 150%
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Ex: Convert 5/8 to a percent
85 %100 %
1100
85 %
8500
Simplify?
Yes!
Simplify? Yes!
Simplify? No . . . done
%8462
%2162
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Ex: Convert 5/6 to a percent
65 %100 %
1100
65 %
6500
Simplify?
Yes!
Simplify? Yes!
Simplify? No . . . done
%6283
%3183
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Your Turn to Try a Few
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Converting a Decimal to a %
• To convert a decimal to a percent, reverse the procedure for converting a percent to a decimal:
• Multiply by 100 and add the % sign • Move the decimal point two places to the
right
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Ex: Convert 0.36 to a %0.36 %100 0.36 = 36%
Ex: Convert 0.01 to a %
0.01 0.01 = 1%%100
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Ex: Convert 3.19 to a %3.19 %100 3.19 = 319%
Ex: Convert 0.005 to a %
0.005 0.005 = 0.5%%100
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Your Turn to Try a Few
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The BASIC PERCENT EQUATION
• The Basic Percent Equation is given by
Percent x Base = Amount• The Percent has the percent sign %
• The Base always follows the word “of”
• The other number is the Amount
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Ex: 5% of 120 is what?• Identify the three components (remember, the base always follows “of”, the multiplication, and the equals.
Percent =Base =Amount =
• Translate the English statement to the Basic Percent Equation: 5% x 120 = a
5%120 (follows “of”)
Unknown “what” a
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Ex: Cont. 5% of 120 is what?• Now solve the mathematical equation:
5% x 120 = a
0.05 x 120 = a
6.00 = a
Perform the math operation
Rewrite the % in working form
Therefore, 5% of 120 is 6.
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Ex: What is 6.3% of 150?Identify the three components (remember, the base always follows “of”, the multiplication, and the equals.
Percent =Base =Amount =
• Translate the English statement to the Basic Percent Equation: a = 6.3% x 150
6.3%150 (follows “of”)
Unknown “what” a
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Ex: Cont. What is 6.3% of 150?• Now solve the mathematical equation:
a = 6.3% x 150
a = .063 x 150
a = 9.45
Perform the math operation
Rewrite the % in working form
Therefore, 9.45 is 6.3% of 150.
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Ex: 5% of what is 28?• Identify the three components (remember, the base always follows “of”, the multiplication, and the equals.
Percent =Base =Amount =
• Translate the English statement to the Basic Percent Equation: 5% x b = 28
5%Unknown “what” b (follows “of”)
28
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Ex: Cont. 5% of what is 28?• Now solve the mathematical equation:
5% x b = 28
0.05 x b = 28
b = 560
Solve the equation by dividing both sides by 0.05or multiply by 100/5
Rewrite the % in working form
Therefore, 5% of 560 is 28.
100/5 x 0.05 x b = 100/5 x 2820 x 0.05 x b = 20 x 28
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Ex: What % of 32 is 20?• Identify the three components (remember, the base always follows “of”, the multiplication, and the equals.
Percent =Base =Amount =• Translate the English statement to the Basic Percent Equation: p x 32 = 20
Unknown “what” p32 (follows “of”)
20
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Ex: Cont. What % of 32 is 20?• Now solve the mathematical equation:
p x 32 = 20
p = 0.625
Solve the equation by dividing both sides by 32
Therefore, 62.5% of 32 is 20.
This is the decimal form of the percent. Rewrite using the % sign
p = 0.625 = 62.5%
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Your Turn to Try a Few
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Ex: The human body contains 206 bones. The fingers and the toes contain a total of 56 small
bones, or phalanges. What percent of the bones of the
body are phalanges? Find the sentence that will be your equation (percent, base, amount, of, “is”)
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• Identify the three components (remember, the base always follows “of”, the multiplication, and the equals: What percent of the bones of the body are phalanges?
Percent =Base =Amount =
• Write a hybrid sentence – half in math, half in English: p x bones of the body = phalanges
Unknown “what” pBones of the body (follows “of”)
phalangesMultiplication “of” Equals “is”
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• Now solve the mathematical equation:p x 206 = 56
p = 0.2718 . . .
Solve the equation by dividing both sides by 206
This is the decimal form of the percent. Rewrite using the % sign
p = 0.2718 . . . = 27.2%
Translate the hybrid sentence into the Basic Percent EquationThe human body contains 206 bones. The fingers and the toes contain a total of 56 small bones, or phalanges.
p x 206 = 56p x bones of the body = phalanges
Therefore, about 27.2% of bones are phalanges.
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Ex: The new 8-mile nature trail is 125% of the length of the
original trail. How long was the original trail?
Find the sentence that will be your equation (percent, base, amount, of, “is”)
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• Identify the three components (remember, the base always follows “of”, the multiplication, and the equals: The new 8-mile nature trail is 125% of the length of the original trail.
Percent =Base =Amount =
• Write a hybrid sentence – half in math, half in English:125% x original trail = new trail
125%Original trail length = b (follows “of”)
New 8-mile trailMultiplication “of” Equals “is”
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• Now solve the mathematical equation:1.25 x b = 8
b = 6.4
Solve the equation by dividing both sides by 1.25 or multiply by 100/125
• Translate the hybrid sentence into the Basic Percent Equation
125% x b = 8
125% x original trail = new trail
Therefore, the original trail was 6.4 miles.
100/125 x 1.25 x b = 100/125 x 8
4/5 x 1.25 x b = 4/5 x 8 32/5 = 6.4
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Ex: A medical supply company charges 5% of the order total as a shipping and handling charge.
If the shipping and handling charge is $38.75, what was the
cost of the order? Find the sentence that will be your equation (percent, base, amount, of, “is”)
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• Identify the three components (remember, the base always follows “of”, the multiplication, and the equals: 5% of the order total as a shipping and handling charge.
Percent =Base =Amount =
• Write a hybrid sentence – half in math, half in English: 5% x order total = S & H
5%Order total = b (follows “of”)
S&H chargeMultiplication “of” Equals “is”
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• Now solve the mathematical equation:
0.05 x b = 38.75
b = 775
Solve the equation by dividing both sides by 0.05 or multiply by 100/5
• Translate the hybrid sentence into the Basic Percent Equation
5% x b = 38.75
5% x order total = S & H
Therefore, the cost of the order was $775.00.
100/5 x 0.05 x b = 100/5 x 38.75 20 x 0.05 x b = 20 x 38.75
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More Practice:Ex: 26.1% of the 364 patients admitted in an emergency room are admitted due to an auto accident injury. How many patients are admitted
due to an auto accident injury?Find the sentence that will be your equation (percent, base, amount, of, “is”)
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• Identify the three components (remember, the base always follows “of”, the multiplication, and the equals: 26.1% of the 364 patients admitted in an emergency room are admitted due
to an auto accident injury.
Percent =Base =Amount =
• Write a hybrid sentence – half in math, half in English: 26.1% x admitted patients = admitted due
to auto accident
26.1%Admitted patients (follows “of”)
Admitted due to auto accident = a
Multiplication “of” Equals “is”
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• Now solve the mathematical equation:.261 x 364 = a
95.004 = a
Solve the equation by multiplying
• Translate the hybrid sentence into the Basic Percent Equation 26.1% of the 364 patients admitted in an emergency room are admitted due to an auto accident injury.
26.1% x 364 = a
26.1% x admitted patients = admitted due to auto accident
Therefore, 95 patients were admitted due to an auto accident injury.
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