Percents II之二.ppt

Percents II之二
Date
Definition
Percent can be defined as “of
one hundred.”
100
of
Copyright © 2000 by MoniPercents II之二
Date
Definition
Percent can be defined as “of
one hundred.”
100
of
Copyright © 2000 by Monica Yuskaitis
20 % Means
20 parts out of 100 or 20 hundredths.
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Copyright © 2000 by Monica Yuskaitis
Percents Have Equivalents in Decimals and Fractions
20%
.20
20
100
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5
=
=
=
Decimal
Fraction
Fraction
Simplified
Percent
Copyright © 2000 by Monica Yuskaitis
How to Find the Percent of a Whole Number
The first thing to remember is “of” means multiply in mathematics.
of
=
x
Copyright © 2000 by Monica Yuskaitis
How to Find the Percent of a Whole Number
Step 1 - When you see a percent problem you know when you read “of” in the problem you multiply.
25% of 200
x
Copyright © 2000 by Monica Yuskaitis
How to Find the Percent of a Whole Number
Step 2 – Change your percent to a decimal and then move it two places to the left.
25% x 200
.
.
Copyright © 2000 by Monica Yuskaitis
How to Find the Percent of a Whole Number
Step 3 – Multiply just like a regular decimal multiplication problem.
200
x .
25
1000
+400
5000
Copyright © 2000 by Monica Yuskaitis
How to Find the Percent of a Whole Number
Step 4 – Place the decimal point 2 places to the left in your answer.
200
x .
25
1000
+400
5000
.
Copyright © 2000 by Monica Yuskaitis