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November 17, 2010

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- Write your homework in your agenda:
- Open your agenda to your behavior card.

Conversions

Being able to use fractions, decimals and percents interchangeably

Rational numbers (decimals, fractions, and percents)

How will I show that I learned it?

To understand and use rational numbers to convert between fractions, decimals, and percents.

- You can remember that percentmeans “per hundred.” For example, 8% means “8 per hundred,” or “8 out of 100.”
- Most states charge sales tax on items you purchase. Sales tax is a percent of the item’s price. A percent is a ratio of a number to 100.

2

5

40%

.40

2

5

40%

.40

Questions Answers

How do I change from a percent to a decimal?

- Move the decimal point

two places to the left.

- Drop the percent sign.

*This is the same as

dividing by 100.

Change the percent to a decimal.

19 % =

.19

4 % =

.04

17 % =

.17

2

5

40%

.40

Questions Answers

How do I change from a decimal to a percent?

- Replace the % with a

decimal

- Move the decimal point

two places to the right

- Attach a percent sign

*This is the same as

multiplying by 100.

Flip Book

Decimal to Percent

Move your decimal 2 places to the right and add a % sign

EX: 0.67 =

Change the decimal to a percent.

.5 =

50%

.02 =

2 %

130 %

1.3 =

2

5

40%

.40

Questions Answers

How do I change from a percent to a decimal?

- Move the decimal point

two places to the left.

- Drop the percent sign.

*This is the same as

dividing by 100.

Flip Book

Percent to Decimal

Drop the %, move the decimal 2 places to the left.

EX: 65% =

Change the percent to a decimal.

19 % =

.19

4 % =

.04

17 % =

.17

2

5

40%

.40

Questions Answers

How do I change from a decimal to a fraction?

- Write it as you would

read it

- The number itself is the

numerator

- The denominator is the

place value

- SIMPLIFY

Flip Book

Decimals to Fractions

Write the number as the numerator over its place value & simplify

EX: 0.45 =

Change the decimal to a fraction:

43

.43 =

100

1

.01 =

100

2

5

40%

.40

Questions Answers

How do I change from a fraction to a decimal?

- Divide the denominator

into the numerator.

- Try to divide out to the

thousandths place to see

if it’s a terminating or

repeating decimal

Flip Book

Fractions to Decimals

Divide the denominator into the numerator

EX: 2/5 =

Change the fraction to a decimal:

4

=

0.8

5

7

0.875

=

8

2

5

40%

.40

Questions Answers

How do I change from a percent to a fraction?

- Put the number over 100

and reduce

- Drop the percent sign.

*Remember, “percent” means “per hundred”

Flip Book

Percents to Fractions

Write the number over 100 & simplify

EX: 96% =

Change the percent to a fraction:

32

16

8

32 % =

=

=

100

50

25

7

35

=

35% =

20

100

2

5

40%

.40

Questions Answers

How do I change from a fraction to a percent?

- Convert fraction to a

decimal number by

dividing the numerator by

the denominator

- Move the decimal point

two places to the right.

- Attach a percent sign.

Flip Book

Fractions to Percents

Change the fraction to a decimal, then to a percent by moving the decimal 2 places to the right

EX: 1/2 =

Change the fraction to a percent:

3

=

15 ) 3

= 0.2 = 20%

15

5

=

8 ) 5

= 0.625 = 62.5%

8

7

1.

.23

23

2.

70%

10

100

Convert to a fraction:

Convert to a percent:

3.

4.

1

.23

23%

0.2 = 20%

5

Convert to a decimal:

5.

6.

1

70%

0.7

0.2

5