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RatioS and ProportionS

  My first presentation
What is a ratio

A ratio is a comparison of two terms. For instance,
every dog has four legs, that is a ratio of 1:4 or 4:1
What happens if I have 2dogs?

Since I have two dogs, I would have 8 legs because
every dog has four legs, and that is a r...
A Proportion

Since the ratio 1:4 means that every dog has four
legs then the situation where I have two dogs
creates a ne...
Creating Proportions

1:4 can also be written as 1/4. To find missing
values of a proportion I just have to use my head, f...
Another Proportion

If I started with 2:3 and I wanted to find d:15. I
would have to know that 15 is 5 times bigger than 3...
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Ratios and Proportions_2010

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This is an example of a presentation that students can create using iPod Touch App, Keypoint. I am looking at different applications for having students create and share work using the Touch.

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Ratios and Proportions_2010

  1. 1. RatioS and ProportionS My first presentation
  2. 2. What is a ratio A ratio is a comparison of two terms. For instance, every dog has four legs, that is a ratio of 1:4 or 4:1
  3. 3. What happens if I have 2dogs? Since I have two dogs, I would have 8 legs because every dog has four legs, and that is a ratio of 2:8 or 8:2.
  4. 4. A Proportion Since the ratio 1:4 means that every dog has four legs then the situation where I have two dogs creates a new ratio of 2:8, & the two ratios create a proportion.
  5. 5. Creating Proportions 1:4 can also be written as 1/4. To find missing values of a proportion I just have to use my head, for instance since 1/4 = 2/x, I can figure out that 2 is double 1, so I would double 4 to get 8, & I get a proportion.
  6. 6. Another Proportion If I started with 2:3 and I wanted to find d:15. I would have to know that 15 is 5 times bigger than 3 and then multiply 2 x 5 to get 10, that makes the proportion 2:3 = 10:15

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