Ratio and Proportion
Presentation
•
Mathematics
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7th - 8th Grade
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Practice Problem
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Medium
Shaina Thomas-York
Used 100+ times
FREE Resource
9 Slides • 2 Questions
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Ratio and Proportion
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Ratio and Proportion
Ratio
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What is a ratio?
A Ratio tells us how much of one thing there is compared to another
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What do we use Ratios for? How Can We See it Around Us?
Recipes (100ml flour to 1 part salt)
Mixing drinks (1 part cordial to 6 parts water) Building (4 parts sand to 1 part cement)
Maps (1cm to 1km/mile)
Plans (scale drawings)
Infection Rates (1 person may infect 1.5 other people, etc) (COVID-19)
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Sharing Ratios (for example, how do we split $240 in the ratio 3:1)?
Add the Ratio Numbers up (3:1 3+1 = 4)
Divide $240 by 4 = $60
Why four?
Multiply each part of the ratio by $60
Why 60?
3 x 60 = 180, and 1 x 60 = 60 Check the amounts add up correctly ($180 + $60 = $240)
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Multiple Choice
Bob and Ben win $100 and agree to split the winnings in the ratio 2:3 How much does Ben get?
$30
$40
$50
$60
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Multiple Choice
Bob and Ben win $100 and agree to split the winnings in the ratio 2:3 How much does Ben get?
$30
$40
$50
$60
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Ratio and Proportion
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