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Ratios and Proportions

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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.
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