41 RATIOS AND PROPORTIONS

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4-1 RATIOS AND PROPORTIONS

• Define
• Ratio 3. Extremes
• Proportion 4. Means
• Means-Extremes Property of Proportions

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• C. Examples

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4-2 PERCENT

• Define Percent
• Change to a percent
• Decimal to percent
• Move decimal point 2 places Right
• Fraction to percent
• Change to decimal, then to

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• C. Solving using Proportions
• Set-up
• Examples
• D. Solving using Equations
• Steps
• Translate b. Solve
• Examples

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• E. Examples
• What is 15 of 112?
• 17 is what percent of 72?
• What number is 40 of 58?

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• E. Examples
• What ifs 15 of 112?
• 17 is what percent of 72?
• What number is 40 of 58?
• ANSWERS
• 16.8
• 23.6
• 23.2

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4-3 APPLICATION SIMPLE INTEREST

• Formula Iprt
• I Interest
• P Principal
• R Rate
• T Time in years

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• B. Examples
• Find I if p5000, r5, t3years.
• Find I if p8000, r9, t2years.
• Find p if I655, r8, t4years, 3 months.

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4-4 PERCENT OF CHANGE

• Define
• Percent Decrease
• Percent Increase
• List Real Life Examples
• Percent Decrease
• Percent Increase

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• C. Formula
• r percent of increase or decrease

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• D. Examples
• Original 18.50 New 16.50
• Original 21 Percent Increase 8
• What number increased by 40 is 14?

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4-6 APPLICATION MIXTURES

• Steps
• Draw the chart
• Fill in the chart
• Write an equation
• Solve
• Check

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• B. Charts (P. 154-156)
• 1-6
• C. Examples
• P.156 (7)
• P. 156 (8)

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4-7 UNIFORM MOTION

• Define Uniform Motion
• Formula rt d
• r
• t
• d

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4-7 UNIFORM MOTION

• Define Uniform Motion
• Formula rt d
• r rate
• t time
• d distance

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4-8 DIRECT VARIATION

• Define
• Direct variation
• Constant of variation
• Using proportions to find x or y

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• C. Find k
• D. Examples
• P. 164 (9)
• P. 164 (15)

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4-9 INVERSE VARIATON

• Define Inverse Variation
• Property of Levers
• Examples
• P. 168 (20)

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What would happen here?