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A ratio can have equivalent ratios just like a fraction can have equivalent fractions.

If you know the ratio of students to teachers is 5 to 1 and you know there are 15 teachers, is there a way to figure out the number of students?. In this lesson you will learn to solve for missing values in a ratio problem by using multiplicative reasoning.

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A ratio can have equivalent ratios just like a fraction can have equivalent fractions.

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  1. If you know the ratio of students to teachers is 5 to 1 and you know there are 15 teachers, is there a way to figure out the number of students?

  2. In this lesson you will learn to solve for missing values in a ratio problem by using multiplicative reasoning

  3. A ratio can have equivalent ratios just like a fraction can have equivalent fractions. 2 : 1 x3 x3 6 : 3

  4. The ratio of students to teachers is 5 to 1. There are 15 teachers. 5 1 students wrong row! 15 ? teachers

  5. Andy has a ratio of books to DVDS of 3 : 2 in his room. If he has 15 books, how many DVDs does he have? How can I use the ratio to help set up and solve?

  6. Books to DVDs 3 to 2 15 books ? DVDS Ratio Actual 3 2 15 ? Books How many groups of books does Andy have? DVDs

  7. Ratio Actual Books 15 ? 3 2 x 5 DVDs ? = 10 DVDs x 5

  8. In this lesson you have learned to solve for missing values in a ratio problem by using multiplicative reasoning.

  9. Anita collects shells and stones in a ratio of 1 : 2. If she has a total of 6 shells, how many stones does she have?

  10. Create a flipbook with your own ratio problem and illustrations showing how to solve it using multiplicative reasoning.

  11. Annie bakes cookies and cupcakes in a ratio of 2 to 7 for her gift boxes. Her school needs 36 desserts to sell in a bake sale. • How many cupcakes will she bake? • How many cookies will she bake? • Create an illustration and a table to support your work. Explain the multiplicative reasoning used.

  12. George buys oranges and apples at a ratio of 2 :5 for his party. If he has 10 oranges, how many apples does he have? Kelly bakes cupcakes and cookies in a ratio of 5 to 3 for her bakery. If on any given day she bakes 15 cookies, how many cupcakes did she bake that day?

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