converting decimals percent & fractions by mrs. nighs

Converting Decimals Converting Decimals Percent & FractionsPercent & Fractions

By Mrs. Nighs

Mrs. Nighs

Changing a Decimal to a PercentageChanging a Decimal to a Percentage

Move decimal two spaces to the right.

.25 .355 .8

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Changing Percentage to a DecimalChanging Percentage to a Decimal

Move two spaces to the left.

25% 12.5% 5%

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Change a Decimal to a FractionChange a Decimal to a Fraction

Say the name

.2 .3 .45 .125

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Change Percentage to a FractionChange Percentage to a Fraction

Percent means per-hundred. Think of pennies… How many pennies in one dollar?

So make the denominator 100

25% 17% 8% 125%

Change Fractions to Change Fractions to Percentages and Decimals Percentages and Decimals

By Mrs. Nighs

Mrs. Nighs

How to Change Fractions to a How to Change Fractions to a Decimal & then a PercentageDecimal & then a Percentage

Step 1 - Divide the denominator into the numerator.

34

Stop! You can’tdivide a largernumber into a

smaller number!

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How to Change Fractions to How to Change Fractions to PercentsPercents

Step 1 - Divide the denominator into the numerator.

34

Sure you can if you use decimals.

Just watch!

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Step 2 – Add a decimal behind your dividend and two zeros.

34

Now does it look like you can divide?

4) 3.00

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Step 3 – Place a decimal in your quotient exactly above the decimal.

34

Putting the decimal in the right spot is important.

4) 3.00.

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Step 4 – Divide exactly like you would with long division.

34

Greatjob!

4) 3.00.7

2 820

5

20

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Step 5 – Move the decimal 2 places to the right and change the decimal to a percent sign.

34

Now wasn’t that easy!

.75 %=

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Change this fraction to a percentChange this fraction to a percent

15

The first step is to divide thedenominator

into the numerator.

5)1

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15

The secondstep is to adda decimal &2 zeros after the dividend.

5)1.00

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15

The third step is to place the decimal in the

quotient directly above the decimal.

5)1.00.

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15

The fourth step is to

divide using long division.

5)1.00.2

1 000

0

000

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15

The fifth step is to move the decimal point 2 places to the

right and change it to a percent sign.

5)1.00.2

1 000

0

000

%

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Memorize These EquivalentsMemorize These Equivalents

12143413

=

=

=

=

50%

25%

75%

33.3%

=

=

=

=

66.6%

20%

40%

60%

23152535

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What is the equivalent percent?What is the equivalent percent?

2 = 50%1

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4 = 25%1

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4 = 75%3

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3 = 33.3%1

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3 = 66.6%2

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5 = 20%1

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5 = 40%2

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5 = 60%3

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5 = 80%4

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Whiteboard ActivityWhiteboard Activity

This is an informal assessment teachers use to gauge students understanding.

Please do not look around for the answer. Solve it on your own.

Hold board up until I acknowledge it is correct.

Wait for next question.

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Question # 1Question # 1

Give me the percentage for 0.35?

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5Is what percent?

3

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4Write as a Decimal.

1

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Write 0.8 as a fraction.

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Write 20% as a decimal.

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Write 125% as a decimal.

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Write .35 as a fraction.

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Write .125 as a fraction.

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Give me 6 prime numbers.

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When do you take the Math CAHSEE Test?

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Complete Class workComplete Class workandand

Prepare for QuizPrepare for Quiz

converting decimals percent & fractions by mrs. nighs

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