1. R ATIO MCC6.RP.1 Understand the concept of a ratio and use ratio language to describe a ratio relationship between two quantities.

2. You can compare the different groups by using ratios. A ratio is a comparison of two quantities using division. For a time, the Boston Symphony Orchestra was made up of 95 musicians. Violins29Violas12 Cellos10Basses9 Flutes5Trumpets3 Double reeds8Percussion5 Clarinets4Harp1 Horns6Trombones3

3. For example, you can use a ratio to compare the number of violins (29) with the number of violas (12). This ratio can be written in three ways. Notice that the ratio of violins to violas, is different from the ratio of violas to violins,. The order of the terms is important. 29 12 ___ 29 12 ___ 12 29 ___ 29 to 1229:12 Terms Ratios can be written to compare a part to a part, a part to the whole, or the whole to a part.

4. Writing Ratios Use the table to write the ratio. What is the ratio of cats to rabbits? Animals at the Vet Cats5 Dogs7 Rabbits2 or 5 to 2 or 5:2 5 2 __ Part to part

5. Writing Ratios Use the table to write the ratio. What is the ratio of dogs to total number of pets? or 7 to 14 or 7:14 7 14 __ Part to whole Animals at the Vet Cats5 Dogs7 Rabbits2

6. Writing Ratios Use the table to write the ratio. What is the total number of pets to cats? or 14 to 5 or 14:5 14 5 __ Whole to part Animals at the Vet Cats5 Dogs7 Rabbits2

7. Writing Ratios Use the table to write the ratio. What is the total number of pets to hamsters? or 18 to 9 or 18:9 18 9 __ Whole to part Animals at the Vet Birds6 Hamsters9 Snakes3

8. Writing Ratios Use the table to write the ratio. What is the ratio of birds to total number of pets? Animals at the Vet Birds6 Hamsters9 Snakes3 or 6 to 18 or 6:18 6 18 __ Part to whole

9. Writing Ratios Use the table to write the ratio. What is the ratio of snakes to birds? or 3 to 6 or 3:6 3 6 __ Part to part Animals at the Vet Birds6 Hamsters9 Snakes3

10. Ticket Out the Door Use the table to answer the questions below. 1.What is the ratio of tulips to daffodils? 2.What is the ratio of crocuses to total number of bulbs? 3. What is the ratio of total bulbs to lilies?