november 17, 2010
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November 17, 20101) Write your homework in your agenda:
2) Open your agenda to your behavior card.
ConversionsBeing able to use fractions, decimals
and percents interchangeably
Rational numbers (decimals, fractions, and percents)
What am I Learning Today?
How will I show that I learned it?
To understand and use rational numbers to convert between fractions, decimals, and
percents.
What exactly is a percent?
• You can remember that percent means “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.
Fractions
PercentsDecimals
2 5
40% .40
Fractions
PercentsDecimals
2 5
40% .40
Questions Answers
- Move the decimal point two places to the left.- Drop the percent sign.
*This is the same as dividing by 100.
How do I change from a percent to a decimal?
19 % =
Change the percent to a decimal.
.19
4 % =
.04
17 % =
.17
Fractions
PercentsDecimals
2 5
40% .40
Questions Answers
- 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.
How do I change from a decimal to a percent?
Decimal to Percent
Flip Book
Move your decimal 2 places to the right and
add a % sign
EX: 0.67 =
.5 =
Change the decimal to a percent.
50% .02 =
2 % 1.3 =
130 %
Fractions
PercentsDecimals
2 5
40% .40
Questions Answers
- Move the decimal point two places to the left.- Drop the percent sign.
*This is the same as dividing by 100.
How do I change from a percent to a decimal?
Percent to Decimal
Flip Book
Drop the %, move the decimal 2 places to the
left.
EX: 65% =
19 % =
Change the percent to a decimal.
.19
4 % =
.04
17 % =
.17
Fractions
PercentsDecimals
2 5
40% .40
Questions Answers
- Write it as you would read it- The number itself is the numerator- The denominator is the place value- SIMPLIFY
How do I change from a decimal to a fraction?
Decimals to Fractions
Flip Book
Write the number as the numerator over its
place value & simplify
EX: 0.45 =
.43 =
Change the decimal to a fraction:
43100
.01 = 1100
Fractions
PercentsDecimals
2 5
40% .40
Questions Answers
- Divide the denominator into the numerator.- Try to divide out to the thousandths place to see if it’s a terminating or repeating decimal
How do I change from a fraction to a decimal?
Fractions to Decimals
Flip Book
Divide the denominator into the numerator
EX: 2/5 =
Change the fraction to a decimal:
=
4 5 0.8
7 8 =
0.875
2 5
40% .40
Fractions
PercentsDecimals
Questions Answers
- Put the number over 100 and reduce- Drop the percent sign.
*Remember, “percent” means “per hundred”
How do I change from a percent to a fraction?
Percents to Fractions
Flip Book
Write the number over 100 & simplify
EX: 96% =
32 % =
Change the percent to a fraction:
32100
=
1650
35% =
35100
=
720
8=25
2 5
40% .40
Fractions
PercentsDecimals
Questions Answers
- 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.
How do I change from a fraction to a percent?
Fractions to Percents
Flip Book
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 = 15 ) 3 = 0.2 = 20%
5 8 = 8 ) 5 = 0.625 = 62.5%
Convert to a fraction:1.
3.
5.
Convert to a percent:
Convert to a decimal:
.23
.23 70%
15
70% 15
2.
4.
6.
23100
710
23% 0.2 = 20%
0.7 0.2
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