Jan. 6, 2014
SET-UP (Activate Prior Knowledge & Connect to Challenge Question)
Noise level 0
 S-Sit and organize materials for the lesson… Get your journal,
Springboard book and a sharpened pencil.
 E-Examine and follow teacher’s directions… On your next blank
page, write today’s date at the top. Title this page ~ Percent of
a Number
 T-Take the challenge! Write the CQ in journal below the title:
Challenge Question: What are the 2 methods to find percent of a
number?
PRESENTATION
Noise level 0
Method 1: Create a Proportion
Part
%
Whole
100
Example: What is 15% of 150?
X
15
Cross multiply and Solve:
150
100
100x = 150 ● 15
100x = 2250
100
100
X = 22.5
PRESENTATION
Noise level 0
Method 2: Change the % to a
decimal (move it 2 places to the left)
and multiply the number by the
decimal form.
Example: What is 15% of 150?
(1) Change the % to a decimal… move it 2 places to the left.
15% = .15
(2) Multiply the number by the decimal form.
150 x .15 = 22.5
Reminder:
Multiply like
whole numbers
then put the
decimal back in
Learning Together
Noise level 2
How long do we have to complete the activity: 25 mins
What do we do? With a partner, use your notes to evaluate the following
6 problems. We will go over the correct answers in 25 mins.
1. In a survey, 120 people were asked if they could swim. If 85% said they could,
how many of the people could swim?
2. Beth hits 35% of her times at bat. During the season she was up to bat 80 times.
How many hits did she have?
3. In a survey, 75% of 400 parents said they give their children fruit as a snack. How
many parents of those surveyed is this?
4. The basketball team won 21 games. This is 25% of the games they played. How
many total games did the team play?
5. Kathy has picked 9 ears of corn. This is 18% of the number of ears she needs.
How many ears of corn does she need?
6. Of the 300 senior students, 252 have their driver’s licenses. What percent of the
seniors have their licenses?
Learning Together
Noise level 2
In a survey, 120 people were asked if they could
swim. If 85% said they could, how many of the
people could swim? (When it gives me the total
number and the percent, I prefer Method 2… it takes
less time and is less math!!)
(1) 85% = .85
(2) 120 x .85 = 102 people
Learning Together
Noise level 2
Beth hits 35% of her times at bat. During
the season she was up to bat 80 times.
How many hits did she have?
(1) 35% = .35
(2) 80 x .35 = 28 hits
Learning Together
Noise level 2
In a survey, 75% of 400 parents said they give
their children fruit as a snack. How many
parents of those surveyed is this?
(1)75% = .75
(2)400 x .75 = 300 parents
Learning Together
Noise level 2
The basketball team won 21 games. This is 25%
of the games they played. How many total
games did the team play? (When it doesn’t give
me the total number, I prefer Method 1… it takes a
little more time but ensures that I do the math
correctly!!)
21
25
X
100
25X = 2100
25
25
X = 84 games
Learning Together
Noise level 2
Kathy has picked 9 ears of corn. This is 18% of
the number of ears she needs. How many ears
of corn does she need?
9
18
X
100
Did you notice
that 9 x 2 = 18
so… 100 ÷ 2 =
50??
18X = 900
18
18
X = 50 ears of corn
Learning Together
Noise level 2
Of the 300 senior students, 252 have their driver’s
licenses. What percent of the seniors have their
licenses? (When it asks me to find percent, I prefer
Method 1… it takes a little more time but ensures that I
do the math correctly!!)
252
X
300
100
Did you notice that
300 ÷ 3 = 100
so… 252 ÷ 3 =
84??
300X = 25200
300
300
X = 84% of seniors
Just For Me
Noise level 0
How long do I have to
complete the activity:
25 mins
What do I do? You will
complete Lesson 11-1
Check Your
Understanding on pg.
117. We will go over the
correct answers in 25
minutes.
Assessment
Noise level 0
How long do I have to complete the
activity: 20 mins
What do I do? You will complete
Lesson 11-1 Practice on pg. 118.
This practice will help you prepare
for the QUIZ at the beginning of
class on Wednesday 1/8 over
Percent of a Number. We will go
over the correct answers at the
beginning of class before the quiz.
If you need help… come in for
tutorials in the morning at 7:45 am.
Wrap-up
Noise level 0
W- Write homework assignment in planner
(complete Lesson 11-1 Practice #s 7-16 on
pg. 118, due next class period)
R- Return materials and organize supplies
A-Assess how well you worked in a group or
individually
Did I/we maintain operating standards?
Did I/we work toward learning goals?
Did I/we complete tasks?
P- Praise one another for high quality work:
Tickets for a “P” performance overall