Transcript Do Now 4/3/08 - Howell Township Public Schools

Do Now 4/20/10
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Take out HW from last night.
Text p. 792, #1-8 all
 Text p. 793, #1-6 all
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Copy HW in your planner.
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Text p. 355, #8-24 evens
Skills Review Handbook
“Angles and Measurement”
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There are 4 types of angles:
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Acute angle – has a measure of less than 90°
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Right angle – has a measure of exactly 90°
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Obtuse angle – has a measure of more than 90°
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Straight angle – has a measure of exactly 180°
Skills Review Handbook
“Angles and Measurement”
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Use a protractor to measure an angle.
Skills Review Handbook
“Units of Measurement”
Text p. 792, #1-8 all
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1) 38°
2) 134°
3) 84°
4) 52°
5)
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55°
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6)
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7)
90°
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8)
77°
Text p. 793, #1-6 all
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168°
1) 92°; obtuse
2) 180°; straight angle
3) 61°; acute
4) 157°; obtuse
5) 126°; obtuse
6) 135°; obtuse
Chapter 7 “Percents”
Section 7.1 “Percents and Fractions”
Section 7.2 “Percents and Proportions”
Section 7.3 “Percents and Decimals”
Section 7.4 “The Percent Equation”
Section 7.5 “Percent of Change”
Section 7.6 “Percent Applications”
Section 7.7 “Simple and Compound Interest”
Objective
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SWBAT find a percent of change in a
quantity
Section 7.5 “Percent of Change”
Percent of change indicates how much a
quantity increases or decreases with respect to
the original amount.
The percent of change of a quantity is given by:
Amount of change
x 100
Original amount
The percent is a PERCENT of INCREASE if the
quantity increased and it is a PERCENT of
DECREASE if the quantity decreased.
The percent of change of a quantity is given by:
Amount of change
x 100
Original amount
Find the percent of increase or decrease
(round to the nearest tenth of a %).
Before: 30
After: 45
50% increase
Before: 115 After: 46
60% decrease
Before: 116 After: 146
25.9% increase
The percent of change of a quantity is given by:
Amount of change
x 100
Original amount
The enrollment of Howell Middle School South in
2006-2007 was 1100 students. In the year 2007-2008
the enrollment was 1300 students.
What is the percent of increase or decrease between
the two years?
From 2006-2007 to 2007-2008 the
enrollment increased by 200, therefore
our answer is a percent of increase.
Percent of increase =
2007-2008:
1300
2006-2007: – 1100
change:
200.
actual change
original amount
200
1100
≈0.181818
≈18% increase
The percent of change of a quantity is given by:
Amount of change
x 100
Original amount
There were 2.2 million computers used in public schools in 1991
and 2 million in 1990. Find the percent of increase.
From 1990 to 1991 the number of computers
used increased by 0.2 million or 200,000.
Percent of increase =
amount of change
original amount
1991:
2.2 million
1990:
- 2.0 million
change: 0.2 million or 200,000.
0.2 million
2 million
=0.1
=10%
increase
Who is Watching MTV???
60
People of Watching (in millions)
50
48
40
33
31
30
28
People Watching
28
25
25
1991
1993
20
10
0
1985
1987
1989
1995
1997
Year
Find the percent of change from
1985 to 1987.
change
48 33

original
48
15
 0.3125
48
Decrease 31.25%
Find the percent of change from 1993
to 1997?
change 31 25

original
25
6
 0.24
25
Increase 24%
Using a Percent of Change
There were about 198,000 spectators at the
NCAA Final Four in 1995. The number of
spectators increased by about 12% from 1995 to
2002. About how many spectators were there in
2002?
Spectators in 2002
=
Spectators in 1995
+ Amount of increase
=
198,000
+
(12% · 198,000)
=
198,000
+
23,760
=
221,760
Using a Percent of Change
In 1983, the average price of CD was
$21.50. By 2000, the average price had
decreased by 34.8%. What was the average
price of a CD in 2000?
Price in 2000
=
Price in 1983
x Percent of change
=
$21.50
x (100% – 34.8%)
=
$21.50
x
=
$14.018 = $14.02
65.2%
24
Homework
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Text p. 355, #8-24 evens
Homework
Why Did the Sea Monster Eat 27 Ships Carrying Potatoes?
NOBODY CAN EAT JUST … ONE POTATO SHIP
What Magic Trick Did Poof the Great Perform When He Visited Helsinki?
HE VANISHED INTO FINN AIR