# Bake Sale for 5th Grade Dance

Introduction

MGSE5.NF.4 Apply and extend previous understandings of multiplication to multiply a fraction or whole number by a fraction.

a. Apply and use understanding of multiplication to multiply a fraction or whole number by a fraction.

## Attention! Attention!

The 5th grade students will be hosting a first bake sale this weekend to raise money for the 5th grade dance.  To make baking LOTS of cookies easier, we will double the recipes we use. So, to do that, we need to know how to multiply fractions by whole numbers!

• You will use the resources in this WebQuest to complete this task.

• Once you feel comfortable multiplying fractions by whole numbers, you will choose your favorite recipe.

• You will record the new measurements of your ingredients in your math journal.

• There is an online template to assist you in recording all of your ingredients.

• Feel free to bake your recipe and bring the cookies to the dance!

Process

### Steps to Follow:

1. First you and your partner will learn by watching the video by NumberRock on how to multiply fractions by whole numbers.

Multiplying Fractions with Whole Numbers Song by NUMBEROCK

Next, there is a more detailed video, Multiplying Fractions, that will show you and your partner the step by step process on how to multiply fractions and whole numbers, so you both can double the recipe. Watch the video a few times until you both feel comfortable with the process.

Multiplying Fraction Video

Also, there are some examples written on the chart paper to remind you that multiplication is repeated addition.

Reflection: Discuss with a partner, choose a sentence starter, draw a model, OR create a word problem example to demonstrate or summarize the steps for multiplying a fraction by a whole number.

Sentence Starters:

1. The first step is…

2. This reminds me of…

3. In my mind I see…

4. An easy way to remember the steps is…

Model Example:

Word Problem Example:

1. Every day Tim ran 3 /5 of a mile. How far did he run after 6 days?

• Answer: 6 X 3/5 = 6/1 X 3/5(multiply the numerators 6 and 3 to get 18; Then, multiply the denominators 1 and 5 to get 5). Your answer will be 18/5, which simplifies to 3 ⅗.

Continue with the following short videos to refresh your memory! In your math journal, take notes and write down examples for reference when working with the multiplication of fractions and whole numbers.

Simplest Form Song: Simplifying Fractions by NUMBEROCK

Simplifying Fractions

Improper Fractions and Mixed Numbers by Shmoop

Improper Fractions to Mixed Numbers

Mixed Numbers into Improper Fractions

2. Now practice multiplying fractions by whole numbers. Use the links below to help you! These websites are fun and interactive! These are excellent resources to help you master the skill!

Khan Academy: Multiplying Fractions and Whole Numbers (provides review in video, if needed)

IXL Math

Cool Math 4 Kids

Math Games

Mini Reflection: In your math journal, you and your partner will need to write and show your work for 5 problems from any of the websites that you explored.

3. Now it's time to bake! You are going to choose a recipe below. Your task is to double the recipe (multiply each ingredient by 2). Make sure you copy the table below AND record your new measurements/recipe in your math journal.

Recipe Resources:

Chewy Brownies

Name of Recipe:_________________________________

 Ingredient Amount in recipe Show your work Doubled amount Example:   Almond meal ½ cup 2 x ½ =2/2 1 cup

Mini Reflection: With your partner, discuss the benefit of being able to multiply fractions by a whole number.  In your math your math journal, list other reasons you might use this skill.

Evaluation

Self Evaluation: With your partner, discuss your work in this WebQuest.  Score your teamwork in each of the categories.

 Score Beginning (1) Developing (2) Target (3) My Score Task I have little to no understanding of multiplying fractions by whole numbers. I can multiply fractions by whole numbers, but only doubled some of the ingredients correctly. I mastered multiplying fractions by whole numbers and doubled all ingredients correctly. Process I showed little to no work. I do not know where to begin when multiplying fractions by a whole number. I showed work throughout the equation. I demonstrated most of the process but am unclear about a step. I understand the whole process of multiplying fractions by whole numbers. I completed all the correct steps. Post-Assessment I struggle to multiply fractions by whole numbers. My answers are not in simplest form. (1-2 correct out of 5) I can multiply fractions by whole numbers but have errors in the process. Most answers are in simplest form. (3-4 correct out of 5) I show mastery multiplying fractions by whole numbers. Answers are in simplest form. (5 correct out of 5)
Conclusion

You have learned how to multiply fractions by whole numbers. It is important to understand how to multiply fractions for everyday life skills like baking and cooking!

Extension Activity Challenge: The students in your class enjoyed your cookies, so they want you to make some for the dance. Each batch makes 1 ½ dozen cookies. There will be 300 students at the dance. How many full batches of your recipe will you need to make in order to feed every student? Will there be any left over? If so, how many?

½ dozen cookies cost \$2.00 to make.  You can sell ½ dozen cookies for \$3.00.  If you sell cookies to every student at the dance (300), how much profit will 5th grade earn?

Good Luck! I challenge you!

Credits

Houghton Mifflin Harcourt. (n.d.). Multiply Fractions. Retrieved on June 13, 2019 from, https://www-k6.thinkcentral.com/content/hsp/math/hspmath/na/common/itools_int_9780547584997_/fractions.html

Khan Academy. (2019). Multiplying fractions by whole numbers on a number line. Retrieved on June 13, 2019 from, https://www.khanacademy.org/math/cc-fifth-grade-math/cc-5th-fractions-topic/tcc-5th-mult-fract-and-whole/v/multiplying-fractions-by-whole-numbers-on-the-number-line

LearnZillion. (2019). Multiply fractions by whole numbers: Using models. Retrieved on June 12, 2019 from, https://learnzillion.com/lesson_plans/4654-multiply-fractions-by-whole-numbers-using-models/lesson

Math Playground. (2019). Fraction Manipulatives. https://www.mathplayground.com/math_manipulatives.html

Miller, M. (2015). Multiplying fractions by a whole number. Retrieved on June 13, 2019 from, https://www.homeschoolmath.net/teaching/f/multiplying_fractions_1.php

Splash Math. (n.d.). Retrieved on June 12, 2019 from, https://www.splashmath.com/math-skills/fifth-grade/fractions/multiply-fraction-by-a-whole