Percentage

Presentation

•

Mathematics

•

7th Grade

•

Hard

Joseph Anderson

FREE Resource

27 Slides • 14 Questions

Percentage

Cluster 7

Monday 26th April 2021

Learning objectives

Student understand the concepts about fractions and decimals
Student understand the forms of percentage as fractions and decimals
Student understand the real world problem related to percentages

Timeline

08.30 - 09.15 course 1
09.15 - 09.30 break
09.30 - 10.15 handout
10.15 - 10.30 break 2
10.30 - 11.00 course 2
11.00 - 12.00 lunch break
12.00 - 13.30 handout

What we've learned so far?

How to convert from fraction to percentage (and vice versa). Example: 4/5 = 80% and 35% = 7/20
How to convert from decimal to percentage (and vice versa). Example: 0.12 = 12% and 87% = 0.87

Course 1

Expressing one Quantity as Percentage of Another

Example:

Total population = 5076700

Singaporeans = 3230700

Percentage of Singaporeans = 3230700 / 5076700 × 100% = 64%

Example 3

Multiple Choice

There are 45 male teachers and 75 female teachers. Find the percentage of male teachers

45/75

45/120

37.5%

60%

Multiple Choice

There are 45 male teachers and 75 female teachers. Find the percentage of female teachers

75/45

75/120

62.5%

166.7%

Percentage of male teacher of the female teacher is different than

Percentage of male teacher of the total teacher

Fill in the Blanks

Find the value of the following:

20% of $13.25

(write your answer in two decimal places)

Type answer...

Fill in the Blanks

Find the value of the following:
$15\ \frac{3}{4}\%$ of $640

Type answer...

Fill in the Blanks

Find the value of the following:
2500% of $4.60

Type answer...

Practice now 4 (8 min.)

Write your complete steps in your notebook.

Multiple Choice

What is your answer for the 1st problem?

45 students

1455 students

Multiple Choice

What is your answer for the 2nd problem?

639

729

441

Multiple Choice

True, The percentage of people passed the entrance test is higher in 2011 than 2012

False! The percentage of people passed the entrance test is higher in 2012 than 2011

Practice now 5 (5 min.)

Write your complete steps in your notebook.

Multiple Choice

Which village had a higher percentage?

Village A

Village B

Handout

Do exercise 8A from text book, for all basic level

Course 2

Percentage Change

The change in the value of an item can be expressed as a percentage increase or decrease in the original value.

Example:

A man has an increase of his salary by 5%. His original salary is $100. This means, his final salary by percentage is 105%.

And his final salary is

105% × $100 = $105

The increase of his salary is $105 - $100 = $5.

Percentage Change

On the other hand, a decrease of 5% means his final salary by percentage is 95%

His final salary is

95% × $100 = $95

The decrease of his salary is $100 - $95 = $5.

Key Concept!

(write in your notebook)

Percent Change

https://www.youtube.com/watch?v=5nZEUpZX_P0

Fill in the Blanks

What is your answer for problem 1a ?

Type answer...

Multiple Choice

What is your answer for problem 1b (i) ?

66.7%

0.667%

40%

0.4%

Multiple Choice

What is your answer for problem 1b(ii)

50%

100%

200%

Fill in the Blanks

What is the result when 32 is decreased by 25%?

Type answer...

Multiple Choice

A new car costs $127,000. After one year, its value is $119,380. Find the percentage decrease in the value of the car!

0.06%

0.6%

Practice now 7 (10 min.)

Write your complete steps in your notebook

End of the class

Upload your notebook from today's course.

See you next week.

Percentage

Cluster 7

Monday 26th April 2021

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