6.RP.3a Lesson 2

Tuna Casserole Part 1

Opening

Here is a recipe for tuna casserole.

Ingredients

  • 3 cups cooked elbow-shaped pasta
  • 6 ounce can tuna, drained
  • 10 ounce can cream of chicken soup
  • 1 cup shredded cheddar cheese
  • 112 cups French fried onions

Instructions

Combine the pasta, tuna, soup, and half of the cheese. Transfer into a 9 inch by 18 inch baking dish. Put the remaining cheese on top. Bake 30 minutes at 350 degrees. During the last 5 minutes, add the French fried onions. Let sit for 10 minutes before serving.

 

Tuna Casserole Part 2

Work TIme

Ingredients

  • 3 cups cooked elbow-shaped pasta
  • 6 ounce can tuna, drained
  • 10 ounce can cream of chicken soup
  • 1 cup shredded cheddar cheese
  • 112 cups French fried onions
  1. What is the ratio of the ounces of soup to the cups of shredded cheese to the cups of pasta in one batch of casserole?
  2. How much of each of these 3 ingredients would be needed to make:

             a. twice the amount of casserole?

             b. half the amount of casserole?

             c. five times the amount of casserole?

             d. one-fifth the amount of casserole?

        3.  What is the ratio of cups of pasta to ounces of tuna in one batch of casserole?

        4.  How many batches of casserole would you make if you used the following amounts of ingredients?

            a. 9 cups of pasta and 18 ounces of tuna?

            b. 36 ounces of tuna and 18 cups of pasta?

            c. 1 cup of pasta and 2 ounces of tuna?

What Are Equivalent Ratios?

Work Time

The ratios 5:3 and 10:6 are equivalent ratios.

1.  Is the ratio 15:12 equivalent to these? Explain your reasoning.

2.  Is the ratio 30:18 equivalent to these? Explain your reasoning.

3.  Give two more examples of ratios that are equivalent to 5:3.

4.  How do you know when ratios are equivalent and when they are notequivalent?

5.  Write a definition of equivalent ratios.

Cool Down: Why Are They Equivalent?

  1. Write another ratio that is equivalent to the ratio 4:6.
  2. How do you know that your new ratio is equivalent to 4:6? Explain or show your reasoning.