Understanding Ratio Concepts (6th grade)

1. ------------------------------------- Lesson Title: Understanding Ratio Concepts (Unit 2 Lesson 2) Lesson Duration: 40 minutes --------------------------------------

2. Analysis

3. Assessment

3.1. Student will complete a cool ddown at the end of the lesson to identify students who are having difficulty understanding ratios.

3.2. Students will complete a quiz at the end of the unit.

4. Interactice Practice

4.1. Students will compplete a 7 minutes interactice activity about Ratios on iReady.

5. Objective

5.1. SWBAT compare two quantities to describe a ratio relationship between two quantities by using ratio language.

6. Standard

6.1. 6.RP.A.2 Understand the concept of a unit rate a/b associated with a ratio a:b with b ≠ 0, and use rate language in the context of a ratio relationship. For example, “This recipe has a ratio of 3 cups of flour to 4 cups of sugar, so there is 3/4 cup of flour for each cup of sugar.” “We paid $75 for 15 hamburgers, which is a rate of $5 per hamburger.”

7. Setting

7.1. Classroom setting. 24 students.

8. Direct Instruction

8.1. Lecture: On the whiteboard I will project the following problem.

8.2. Carlos is making baked pears. For every 4 pears he needs 2 cups of yogurt and 6 tablespoons of granola. Create a model to show the ratio relationships for the ingredients in the recipe.

8.3. As a class we will use the information provided to create a visual model to represents the pears, cup of yogurt and tablespoons of granola. I will remind them that when writing ratios the order matters. 5/8 is not the same as 8/5.

9. Student Pratice

9.1. In groups of two or three the students will create a visual model to compare each ratio and find the ratio of ducks as parts and whole.

9.2. Students record the types of ducks they see on a nature walk in Central Park in New York City. They see 8 Mallard Ducks and 5 Ruddy Ducks. Part 1. Draw a model to show the ratio of mallards to ruddy ducks. Part 2. Answer What does the ratio 8 to 13 represent?

10. Independent Practice

10.1. Independently students will complete the following: The puppies in a litter are either black or brown. The ratio of black puppies to the total number of puppies is 3 : 8. What is the ratio of brown puppies to black puppies?

10.2. Students will draw a model. Write the ratio using the word to or a colon and give the soltion in a complete sentence.