# proportions

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Curipod generated lesson: "proportions". #5-7

1. Word cloud
120 seconds
What is a proportion?
2. Slide
60 seconds
Disclaimer: In this presentation, there are slides that are interactive (meaning, you will be able to type in statements or answers). Anything that you type in that is inappropriate will result in a discipline referral.
3. Slide
60 seconds
Understanding Proportions
A proportion is two ratios that are equal to each other. The two ratios can be written as fractions, decimals, or percents. Proportions can help us compare two parts of a whole. For example, if 4 out of 10 students are girls, the proportion of girls is 4/10. In proportion problems, we use cross multiplication to solve for an unknown value. For example, if a = 4/5, what is 5a? The answer is 5a = 4*5 = 20.
4. Slide
60 seconds
proportions
Ratio: A comparison of two numbers or measurements, written as a fraction.
Proportion: An equation that states that two ratios are equal.
Scale: A ratio that compares a length, area, or other measurement on a map to the actual distance or area on the ground.
5. Poll
60 seconds
What is the definition of proportion?
• The total amount of something
• The average value of a set of numbers
• A comparison between two or more quantities
6. Poll
60 seconds
Which symbol is used to represent proportionality?
• =
7. Poll
60 seconds
If 20 apples cost \$10, how much would 30 apples cost?
• \$25
• \$15
• \$20
8. Poll
60 seconds
If it takes a car 2 hours to travel 120 miles, how long would it take for the same car to travel 180 miles at the same speed?
• 4 hours
• 3 hours
• 5 hours
9. Poll
60 seconds
If a recipe requires 2 cups of flour and serves 4 people, how many cups of flour would be needed to serve 8 people?
• 4 cups
• 8 cups
• 6 cups
10. Poll
60 seconds
A granola recipe requires you to use 5 cups of oats for every 3 cups of almonds. How many cups of oats would be needed if you used 12 cups of almonds?
11. Poll
60 seconds
When trying to find the perfect shade of blue for his room, Joe mixed 20 parts of blue with 8 parts of black. Joe will need just a little bit more paint. How much blue will he need if he only uses 2 parts of black?
12. Poll
60 seconds
A hybrid car can go 141 miles on 3 gallons of gasoline. How many miles can it travel with 9 gallons of gasoline?
13. Poll
60 seconds
A hybrid car can go 141 miles on 3 gallons of gasoline. How many miles can it travel with 9 gallons of gasoline?
14. Poll
60 seconds
Jose collects stamps. He has 7 used for every 4 new stamps. If he has 28 new stamps, how many used stamps does he have?
15. Poll
60 seconds
Marcie can mow 9 lawns every 14 hours. How many lawns can she mow in 49 hours?