Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Ratios and Proportions

1,074 views

Published on

Published in: Education, Technology, Business
  • Be the first to comment

Ratios and Proportions

  1. 1. Ratios and Proportions
  2. 2. Definitions • A proportion is two ratios that are equivalent • A ratio is a comparison of two items • Equivalent means equal
  3. 3. How do you write equivalent ratios? 102 1 = 48 9 24 =
  4. 4. To check if 2 ratios are proportional…you can use cross products or cross multiplying 5 2 10 4 = Is 2 x 10 equal to 4 x 5? If yes, you have a proportion!
  5. 5. You try it! Is this a proportion? 8 6 12 9 =
  6. 6. You can also use “scale factor” to see if two ratios form a proportion 8 3 24 9 = x 3 = x 3 = Since 3 x 3 = 9 and 8 x 3 = 24, these ratios do form a proportion! 3 is called the “scale factor”.
  7. 7. You Try it! Is this a proportion? 10 7 15 14 =
  8. 8. You Try it! Is this a proportion? 5 12 15 36 =
  9. 9. Homework: P. 240 #1-9 all; 10-28 evens Copy the proportions and show your work.

×