Understanding Proportions in Oatmeal Cookie Recipe

The video tutorial explains how to determine the amount of flour needed for a batch of oatmeal cookies using 9 cups of oatmeal. It presents two methods: a common sense approach by tripling the ingredients and an algebraic method using proportions and cross-multiplication. The tutorial emphasizes understanding the reasoning behind cross-multiplication and provides a step-by-step algebraic explanation.

What is the initial problem presented in the video regarding the oatmeal cookie recipe?

• How to substitute oatmeal with flour

• How to bake cookies without flour

• How much flour is needed for 9 cups of oatmeal

• How to make cookies with 2 cups of oatmeal

Tags

CCSS.6.RP.A.3B

If the recipe uses 3 cups of oatmeal, how many cups of flour are needed?

• 4 cups

• 3 cups

• 2 cups

• 1 cup

Tags

CCSS.6.RP.A.3B

What is the first method explained to find the amount of flour needed for 9 cups of oatmeal?

• Using a different recipe

• Simple multiplication

• Using a calculator

• Guessing the amount

Tags

CCSS.4.OA.A.1

How many times more oatmeal is used when increasing from 3 cups to 9 cups?

• 2 times

• 3 times

• 4 times

• 5 times

Tags

CCSS.7.EE.B.3

What is the second method introduced to solve the problem?

• Using a proportion

• Using a calculator

• Using a different recipe

• Using a measuring cup

Tags

CCSS.7.EE.B.3

What mathematical concept is used in the second method to solve the problem?

• Cross-multiplication

• Subtraction

• Division

• Addition

In the cross-multiplication method, what is the equation set up to find the number of cups of flour?

• 3 times 9 equals question mark times 2

• 9 times 3 equals question mark times 2

• 2 times 9 equals question mark times 3

• 2 times 3 equals question mark times 9

Tags

CCSS.6.RP.A.3B

What is the final answer for the number of cups of flour needed for 9 cups of oatmeal?

• 7 cups

• 6 cups

• 4 cups

• 5 cups

Tags

CCSS.6.RP.A.3B

Why does cross-multiplication work according to the video?

• It is a shortcut

• It is based on algebra

• It is a guess

• It is a traditional method

Tags

CCSS.RI.5.2

CCSS.RI.7.2

CCSS.RI.8.2

CCSS.RL.7.2

CCSS.RL.8.2

What is emphasized as a simple way to solve the problem?

• Using a measuring cup

• Using a different recipe

• Using common sense

• Using a calculator

Tags

CCSS.RI.6.2

CCSS.RI.7.2

CCSS.RL.5.2

CCSS.RL.6.2

CCSS.RL.7.2