Transcript Document

November 30, 2011
1) Write your homework in your agenda:
All the King’s Crowns worksheet
2) Take out your Decimal Skills worksheet and
leave it on your desk.
3) Warm-Up:
1. 92.1  0.03 3070
2. 20.34  9
2.26
3. 184  1.2
153.33
What am I Learning Today?
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.
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
.40
Decimals
2
5
Percents
40%
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%
1.3
= 130 %
Fractions
.40
Decimals
2
5
Percents
40%
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
Fractions
.40
Decimals
2
5
Percents
40%
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
Fractions
.40
Decimals
2
5
Percents
40%
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
Fractions
.40
Decimals
2
5
Percents
40%
Flip Book
Percents to Fractions
Write the number over
100 & simplify
EX: 96% =
Change the percent to a fraction:
32 % = 32 = 16 = 8
100
50 25
7
35
=
35% =
20
100
Fractions
.40
Decimals
2
5
Percents
40%
Flip Book
Fractions to Percents
Change the fraction to a
decimal first, 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
15
5
= 8)5
8
= 0.2 = 20%
= 0.625 = 62.5%
Convert to a fraction:
1. .23
23
100
2. 70%
7
10
Convert to a percent:
3.
.23
23%
4.
1
5
6.
1
5
0.2 = 20%
Convert to a decimal:
5. 70%
0.7
0.2