Today we will review “Percents”

1 / 26

# Today we will review “Percents” - PowerPoint PPT Presentation

Today we will review “Percents”. Let’s Warm up:. 1) ¾ x ¼ =. 2) 3/5 ÷ 1/4 =. 3) 5/6 x 2/5 =. 4) ½ ÷ ¾ =. Modeling Percents. A percent (%) is a ratio that compares a number to 100 75% = 75 out of 100 Use a 10 x 10 grid to model percents Example: Model 18% 18% means 18 out of 100

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Today we will review “Percents”' - morgan

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Today we will review “Percents”

CONFIDENTIAL

Let’s Warm up:

1) ¾ x ¼ =

2) 3/5 ÷ 1/4 =

3) 5/6 x 2/5 =

4) ½ ÷ ¾ =

CONFIDENTIAL

Modeling Percents
• A percent (%) is a ratio that compares a number to 100
• 75% = 75 out of 100
• Use a 10 x 10 grid to model percents
• Example: Model 18%
• 18% means 18 out of 100
• So, shade 18 out of the 100 squares

CONFIDENTIAL

• Model 75%

CONFIDENTIAL

Modeling Percents
• Identify a percent that is modeled
• There are 40 out of 100 squares shaded
• So, the model shows 40%

CONFIDENTIAL

• Identify the percent modeled.

CONFIDENTIAL

Percents & Fractions
• All percents can be written as fractions in simplest form
• To write a percent as a fraction,
• Write the percent as a fraction with a denominator as 100
• Then simplify
• Write 50% as a fraction in simplest form
• 50% means 50 out of 100

Write the percent as a fraction with a denominator of 100

Simplify. Divide the numerator and the denominator by the GCF, 50

CONFIDENTIAL

Percents & Fractions
• Write 125% as a fraction in simplest form
• 125% means 125 for every 100

CONFIDENTIAL

• Write 10% as a fraction.
• Write 135% as a fraction.

CONFIDENTIAL

Percents & Fractions
• Write a Fraction as a Percent
• Write 9/10 as a percent

CONFIDENTIAL

• Write 3/5 as a percent

CONFIDENTIAL

Percents & Decimals
• Percents can be written as a decimal
• To write a percent as a decimal
• Rewrite the percent as a fraction with a denominator of 100
• Then write the fraction as a decimal
• Write 56% as a decimal
• Shortcut: Move the decimal point two places to the left, which is the same as dividing by 100

CONFIDENTIAL

• Write 0.3% as a decimal

CONFIDENTIAL

Percents & Decimals
• To write a decimal as a percent
• Write the decimal as a fraction whose denominator is 100
• Then write the fraction as a percent
• Write 0.38 as a percent
• 0.38 = 38/100 Write the decimal as a fraction

= 38% Write the fraction as a percent

• Shortcut: Move the decimal place two places to the right, which is same as multiplying by 100

CONFIDENTIAL

• Write 0.189 as a percent

CONFIDENTIAL

Percent of a Number
• To find the percent of a number
• Write the percent as a fraction and then multiply or
• Write the percent as a decimal and then multiply
• Find 5% of 300
• Method 1: Write the percent as a fraction

CONFIDENTIAL

Percent of a Number
• Method 2: Write the percent as a decimal
• Use a model to check the answer.
• The model confirms that 5% of 300 is 15

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0

30

60

90

120

150

180

210

240

270

300

CONFIDENTIAL

• Find 120% of 75.

CONFIDENTIAL

Estimating with Percents
• Sometimes when finding the percent of a number, an exact number is not needed
• So, you can estimate
• Commonly used Percents and their Fraction equivalents

CONFIDENTIAL

Estimating with Percents
• Estimate 52% of 298
• 52% is close to 50% or ½
• Round 298 to 300
• ½ of 300 is 150
• So, 52% of 298 is about 150

CONFIDENTIAL

• Estimate 60% of 27

CONFIDENTIAL

Game

Let us see how much you score on this one!

• Click me

CONFIDENTIAL

Assessment
• Model 8%
• Identify the percent modeled.

CONFIDENTIAL

Assessment
• Write 97% as a fraction in simplest form.
• Write 3/5 as a percent.
• Write 32% as a decimal.
• Write 0.47 as a percent.
• Find 55% of 160.
• Estimate 48% of \$76
• Ian used 35% of his allowance to buy a book. If Ian received \$20 for his allowance, how much did he use to buy the book?
• Melissa bought a sweatshirt that originally cost \$30. If the sweatshirt was on sale for 25% off, what was the discount?

CONFIDENTIAL

Good Job!
• You have learned a lot today!!!

CONFIDENTIAL