# Ratios and Proportions - PowerPoint PPT Presentation

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## Ratios and Proportions

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### Ratios and Proportions Chapter 2 Ratio: comparison of two numbers I got 21 out of 24 questions correct! Write this ratio as a fraction, with a colon, or as ... – PowerPoint PPT presentation

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Title: Ratios and Proportions

1
Ratios and Proportions
• Chapter 2

2
Ratio comparison of two numbers
• I got 21 out of 24 questions correct!
• Write this ratio as a fraction, with a colon, or
as a decimal.
• Fraction
• With a colon
• As a decimal
• How do we find the decimal?

3
Proportion two equal ratios
• Check to see if its a proportion by comparing
the decimals
• Check to see if they are equal by comparing the
fractions

4
Can we use the same numbers and create three
other proportions?
• Dont forget to check your proportions by
comparing the decimals or the fractions

5
Solving Proportions
• Cross multiplication
• Only works when there is an equal sign ()
between two fractions.
• Verify that you are correct

6
Try these
• Use cross multiplication to solve
• Compare the fractions or decimals to check

7
Set up a proportion to solve
• If Julie pays 4.00 for ½ pound of ham at the
deli, how much will 1.25 lbs cost?
• Units must be aligned

8
Try this
• If 18 pieces of candy weigh 2.13 oz, how much
will 30 pieces of candy weigh?
• Check by comparing decimals

9
Percents as Ratios
• Percent per 100
• Can we write 65 as a ratio?
• What is 3 as a ratio?
• What is as a percent?

10
Solve percent questions!
• The proportion can be used to
• answer the question 18 is what percent of 45?
• Remember
• Jean made a 28 out of 35 on a test. What percent
did she get correct?
• 36 is what percent of 50?

11
Write a proportion and solve.
• What is 8 of 14?
• 178 of what number is 49?
• 37 is 15 of what number?

12
Here are the proportions. YOU write the
questions.