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copyright©amberpasillas2010 Calculator Needed Today! For today’s lesson get a calculator!
| Date post: | 30-Dec-2015 |
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Calculator Needed Today!
For today’slessonget a calculator!
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For Learning to Happen:•Take out your calculator.•Remove all other thoughts from your mind.•Pay close attention.•Try all the examples.•Ignore all other distractions.
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Percents are written in different forms.
Percent Form
35%
Verbal Form
35 Percent
Fraction Form
Decimal Form
0.35
35
100
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Percent means “per hundred.”
100of
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To change a Percent to a Decimal : Divide the percent by 100.
*Dividing by 100 results in moving the decimal 2 places to the left.
20%
100 20-200
0
2 0 20.%20
100
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Divide the percent by 100
1) 40%2) 35%3) 51%4) 121%5) 8%6) 3412%
= 0.40= 0.35= 0.51= 1.21= 0.08= 34.12
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Divide the percent by 100
Notice that changing a percent to a decimal results
in moving the decimal 2 places to the left
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Divide the percent by 100
WHY DOES THIS WORK?
Dividing by 100 hundred results in moving the
decimal 2 places to the left.
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D P Multiply by 100
D P Divide by 100
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Move 2 places to the right
Move 2 places to the left
There is a really useful shortcut to change % to decimals, and decimal to % that uses what you know about the alphabet.
D
P
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Decimal Percent
63% 0.63
29100
29% 0.29
D P Right D P Left
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Move 2 places to the right
Move 2 places to the left
Multiply by 100
Divide by 100
Per-cent means per 100
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Decimal Percent
8%0.08
1.2100
1.2%0.012
D P Right D P Left
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Move 2 places to the right
Move 2 places to the left
Multiply by 100
Divide by 100 0
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To change a Percent to a Fraction Put 100 in the denominator and reduce if possible.
42% 42
100
2
2
21
50
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PERCENTS
ANSWER PERCENTS
ANSWER
1) 50% 4) 3%
2) 29% 5) 37.5%
3) 129% 6) 25%
50
100
3
100
29
100
129
100
37.5
100
25
100
Per-cent means per 100
1
2
29
1001
375
100
1
10 0
0
3
8
1
4
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FRACTIONS
ANSWER
FRACTIONS
ANSWER
0.625 0.18
0.1875 1.5
0.5 0.6
5
83
165
10
2
111)
2)
3)
9
63
5
4)
5)
6)
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DECIMALS
ANSWER
DECIMALS
ANSWER
0.3 0.861
0.41 0.35
1.13 0.001
131
100
41
100
3
10
861
1000
35
100
1
1000
1)
2)
3)
4)
5)
6)
Say the decimal using the correct place value.
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78
means 7÷8
0 8 7 5 0.875
87.5%
7.000 8D P Right
Multiply by 100
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61% 0.61
61100
Per-cent means per
100
D P LeftDivide by 100
Say it correctly!
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45
?10
0.8
80%
22
8 0.80D P Right
Multiply by 100
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16100 0.16 16%
91000 0.009 0.9%
310 0.3 30%
2 7
10 2.7 270%
4=25
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REMEMBER: To Always Show Your Work
Take out your study guide!!!
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#7
To change a Percent to a Decimal : Divide the percent by 100.
20%
*Dividing by 100 results in moving the decimal 2 places to the left.
100 20-200
0
2 0 20.%20
100
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To change a Percent to a Fraction : Put 100 in the denominator and reduce if possible.
#8
42% 42
100
2
2
21
50
