7 7 And 7 8
-
Upload
rlowery -
Category
Technology
-
view
212 -
download
5
Transcript of 7 7 And 7 8
7-7 Percent of a Numberand
7-8 The percent Proportion
Turn and Talk
• What’s your favorite subject in school?
Favorite Subject
• A graph at the right shows the results of a survey in which 1,016 people were asked their favorite subject.
• About how many of them said language?
• How did you estimate?Scie
nce
Mat
h
Histor
y
Lang
uagePE
Favorite Subject
• Suppose you pass 50 people at the mall, do you think more or less than 25 of them would choose PE as their favorite subject? Explain
Scienc
eM
ath
Histor
y
Lang
uagePE
Using PROPORTIONS!!!
• The graphic shows that 12% of the 1,016 students chose science as their favorite subject.
• How many of the students chose science?Scie
nce
Mat
h
Histor
y
Lang
uagePEtotal
part
100
%of
is
Using EQUATIONS!!!
• The graphic shows that 12% of the 1,016 students chose science as their favorite subject.
• How many of the students chose science?Scie
nce
Mat
h
Histor
y
Lang
uagePE
Example 1
• Out of 1,423 adults surveyed, 30% said they knew the name of their mail carrier. How many of the people surveyed knew their mail carrier’s name?
• Use a proportion and equation (T-chart)
Example 2
• What number is 140% of 32?
Example 3
• Find 75% of $800
Example 4
• What number is 120% of 24?
Example 5
• Find 25% of $600
Your TurnWork one with a proportion and one
with an equation
A. Fifty percent of 140 is what number?
B. Find 37.5% of 64
Example 6
• What percent of $15 is $9?
Example 7 With a partner-set up the proportion on each problemA. What percent of 6 is 3?
B. What number is 50% of 6?
C. 3 is 50% of what number?
Example 8
• What number is 40% of 120?
Example 9
• 18 is 25% of what number?
Example 10
• What percent of 24 is 18?
Example 11
• What number is 30% of 150?
Example 12
• 12 is 80% of what number?
Your Turn
a. What number is 5% of 60?
b. 80 is 75% of what number?
Journal
• Which method do you prefer?
• Why?
Homework
• p 320: 3, 10-18 even, 22 (7 problems)
• p 325: 8-18 even, 21, 24 (8 problems)