Brenna is making brownies. She wants to make an extra pan for her grandparents, so she is doubling the recipe. If the original recipe calls for 

n

 units of an ingredient, she uses 

2

n

 units for her doubled recipe. The original recipe calls for 1.5 teaspoons of vanilla extract.

How much vanilla extract should Brenna use in her doubled recipe?

*Write* *your answer as a whole number or* *decimal.*

Brenna is doubling the recipe, so she needs to use \( 2n \) units of each ingredient, where \( n \) is the amount called for in the original recipe.

The original recipe calls for 1.5 teaspoons of vanilla extract. To find out how much vanilla extract she should use in the doubled recipe, we multiply this amount by 2:

\[
2 \times 1.5 = 3.0
\]

So, Brenna should use **3.0 teaspoons** of vanilla extract in her doubled recipe.

Would you like more details on this solution or have any other questions?

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Here are 5 related questions you might find interesting:
1. If Brenna decides to triple the recipe, how much vanilla extract would she need?
2. How much vanilla extract would she use if she were to make half of the original recipe?
3. If Brenna mistakenly used 4.5 teaspoons of vanilla extract, how many times the original amount did she use?
4. What if the original recipe calls for 2.25 teaspoons of vanilla extract? How much would she need in the doubled recipe?
5. If Brenna needs to make 5 pans of brownies, how much vanilla extract will she need in total?

**Tip:** When doubling a recipe, remember to multiply each ingredient by 2. For fractional measurements, this might require converting fractions to decimals first.

Learn how to calculate the amount of vanilla extract needed for a doubled brownie recipe. Understand the concept of doubling ingredients and apply it to fractional measurements, such as teaspoons. Suitable for students in Grades 4-6.

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