5 Minute Check
Find the following.
1. What is .15 written as a percent?
2. What is 0.399 written as a percent?
1
3. What is 7 written as a percent?
5
4. What is 575% written as a mixed number?
5. What is 22.5% written as a fraction in
simplest form?
1
6. What is 6 4 written as a decimal?
5 Minute Check
Find the following.
1. What is .15 written as a percent?
5 Minute Check
Find the following.
1. What is .15 written as a percent?
.15 x 100 = 15%
5 Minute Check
Find the following.
2. What is 0.399 written as a percent?
5 Minute Check
Find the following.
2. What is 0.399 written as a percent?
.399 x 100 = 39.9%
5 Minute Check
Find the following.
1
5
3. What is 7 written as a percent?
5 Minute Check
Find the following.
1
5
3. What is 7 written as a percent?
1
75
=
36
5
36 ÷ 5 = 7.2
7.2 x 100 = 720%
5 Minute Check
Find the following.
4. What is 575% written as a mixed number?
5 Minute Check
Find the following.
4. What is 575% written as a mixed number?
575 ÷ 100 = 5.75
75
5.75 = 5 100
5
75
100
= 5
3
4
5 Minute Check
Find the following.
5. What is 22.5% written as a fraction in
simplest form?
5 Minute Check
Find the following.
5. What is 22.5% written as a fraction in
simplest form?
22.5 ÷ 100 = .225
.225 =
225
1000
=
9
40
5 Minute Check
Find the following.
6. What is
1
64
written as a decimal?
5 Minute Check
Find the following.
6. What is
6
1
64
1
4
=
written as a decimal?
25
4
25 ÷ 4 = 6.25
Tuesday, Oct 1
Lesson 2.7
Percent of a Number
Percent of a Number
Objective: To find the percent of a number.
Percent of a Number
Percent of a Number
At the end of this lesson you should be able
to answer the following questions.
How do you find the percent of a number?
Percent of a Number
There are two methods to find the percent of
a number.
Percent of a Number
Find 40% of 80.
Method 1
Step 1 – Set up a proportion.
40
100
=
?
80
Percent of a Number
Find 40% of 80.
Method 1
Step 2 – Simplify.
40
?
100
80
=
2
5
=
?
80
Percent of a Number
Find 40% of 80.
Method 1
Step 3 – Cross Multiply.
2
5
=
?
80
2 x 80 = 160 ÷ 5 = 32
Percent of a Number
Find 60% of 90.
(Do this on your own)
Percent of a Number
Find 60% of 90.
(Do this on your own)
60
?
100
90
3
?
5
90
=
=
3 x 90 = 270 ÷ 5 = 54
Percent of a Number
Suppose there are 300 students at Central
Middle School. Find the number of students
that have cheese as a snack.
Method 2
Step 1 – Convert the
percent to a decimal.
15% = .15
Percent of a Number
Suppose there are 300 students at Central
Middle School. Find the number of students
that have cheese as a snack.
Method 2
Step 2 – Multiply the
Decimal by the number.
.15 x 300 = 45
Percent of a Number
Suppose there are 300 students at Central
Middle School. Find the number of students
that have cheese as a snack.
Find the number of
students that have chips
as a snack.
(Do this on your own)
Percent of a Number
Suppose there are 300 students at Central
Middle School. Find the number of students
that have cheese as a snack.
Find the number of
students that have chips
as a snack.
18% = .18
.18 x 300 = 54
Percent of a Number
Find 145% of 320.
(Do this on your own)
Percent of a Number
Find 145% of 320.
145% = 1.45
1.45 x 320 = 464
Since the procedure to convert a percent to a
decimal involves removing the percent sign,
the answer should have no percent sign.
Percent of a Number
Find 145% of 320
Calculator Shortcut –
“145”, press “2nd”, press “%”, then “320”, then
press “enter”.
(You may want to write this down)
Percent of a Number
Find 220% of 65.
(Do this on your own)
Percent of a Number
Find 220% of 65.
220% = 2.2
2.2 x 65 = 143
Percent of a Number
Find .25% of 58.
(Do this on your own)
Percent of a Number
Find .25% of 58.
.25% = .0025
.0025 x 58 = .145
Percent of a Number
Find 128% of 550.
(Do this on your own)
Percent of a Number
Find 128% of 550.
128% = 1.28
1.28 x 550 = 704
Percent of a Number
Find .3 % of 200.
(Do this on your own)
Percent of a Number
Find .3 % of 200.
.3% = .003
.003 x 200 = .6
Percent of a Number
In a recent state Special Olympics meet,
Franklin County sent a team of 70 players.
Twenty percent of the team competed in
soccer. How many athletes competed in
soccer?
(Do this on your own)
Percent of a Number
In a recent state Special Olympics meet,
Franklin County sent a team of 70 players.
Twenty percent of the team competed in
soccer. How many athletes competed in
soccer?
20% = .20
.2 x 70 = 14
Percent of a Number
In this same meet 15% of the team from
Delaware County competed in tennis. If
there were 20 members on the team, how
many played tennis?
(Do this on your own)
Percent of a Number
In this same meet 15% of the team from
Delaware County competed in tennis. If
there were 20 members on the team, how
many played tennis?
15% = .15
.15 x 20 = 3
Percent of a Number
Complete the Guided Practice on page 150
Agenda Notes
Homework –
Homework Practice 2-7
Due Wednesday, Oct 2
Chapter 2 Test - Friday, Oct 4
Due to conferences, no help session this
chapter.