 Unit 1: The Number System   Imagine that you are shopping. There are signs everywhere for different sales. You only have a set amount to spend and need to calculate an estimate for the discount and the tax. This is just one of the many applications that you will be able complete at the end of Unit 1.

In this unit, you will continue to build on the decimal and fraction skills you started in previous courses. These rational numbers will be expanded upon by the addition of positive and negative numbers working together within the four operations. A focus on the properties will help you gain an understanding of how the rational numbers work. You will then extend these skills to applications of percentages, including discounts, taxes, commissions, and others.

Completing this unit should take approximately 20 hours and 25 minutes.

☐    Subunit 1.1: 10 hours and 5 minutes

☐    Subunit 1.2: 10 hours and 20 minutes

Unit1 Learning Outcomes
Upon successful completion of this unit, you will be able to: - Solve problems involving integers.
- Extend the rules of integers to work with other rational numbers, such as fractions and decimals.
- Apply the properties of operations in order to solve problems involving all four operations.
- Write percentages as decimals and fractions.
- Use percentages to solve real-world problems.

Standards Addressed (Common Core): - CCSS.Math.Content.7.NS.A.1
- CCSS.Math.Content.7.NS.A.2
- CCSS.Math.Content.7.RP.A.3
- CCSS.ELA-Literacy.WHST.6-8.2

1.1 Working with Rational Numbers   Rational numbers are used in everything we do. There are fractions in cooking and baking, construction, and even using a ruler. Decimals are also used when measuring items including amounts of money. This section will build your skills with positive and negative numbers. Then you will expand these skills to include positive and negative fractions and positive and negative decimals. Becoming an expert in working with rational numbers will help you to be more successful in the following sections and units as the rational numbers are used throughout the different applications.

• Explanation: CK-12: Jack Hatert’s “Rational Numbers” Link: CK-12: Jack Hatert’s “Rational Numbers” (PDF)

Instructions: Read “Rational Numbers” to learn about the properties used to complete operations with rational numbers. Then complete “Time to Practice” problems at the bottom of the webpage.

Completing this activity should take approximately 40 minutes.

Instructions: Read “Adding Integers” to learn about using the number line to add positive and negative whole numbers. Watch the first video, which is from Khan Academy. Then complete the “Time to Practice” problems at the bottom of the webpage.

Completing this activity should take approximately 1 hour.

`````` Standards Addressed (*Common Core*):

-   [CCSS.Math.Content.7.NS.A.1](http://www.corestandards.org/Math/Content/7/NS/A/1)

text is attributed to CK-12 Foundation and the video is attributed
to Khan Academy. The original version can be
``````
• Did I Get This? Activity: XP Math: “Integers Addition Blocks” Link: XP Math: “Integers Addition Blocks” (Flash)

Instructions: After you hit the start button, you will be given a number on the right that will be your answer. You have to come up with the numbers that would make up the question. For example, if the answer is -10, your question could be -8 + -2. So you would click on the boxes -8 and -2. Play the game five times.

Completing this activity should take approximately 10 minutes.

• Did I Get This? Activity: XP Math: “Integer Driving Test - Integer Addition & Subtraction” Link: XP Math: “Integer Driving Test - Integer Addition & Subtraction” (Flash)

Instructions: Go to the left-hand side of the webpage and change the car, if you wish. Then click on “Take the Test,” and you will be given questions involving integers. You can either “Drive Forward” or “Drive Backward” to get your car to drive to the answer on the number line. Then press the license plate “Check” button to see if your answer is correct. Play this game twice. Note that this activity covers the material you need to know for Subunit 1.1.1.1 and Subunit 1.1.1.2.

Completing this activity should take approximately 10 minutes.

1.1.1.2 Subtracting Integers   Note: This subunit is covered by the activity assigned beneath Subunit 1.1.1.1. Focus specifically on solving the subtraction questions and how the steps are related to the method used for solving addition questions.

• Explanation: CK-12: “Subtracting Integers - Overview” Link: CK-12: “Subtracting Integers - Overview” (YouTube)

Instructions: Watch the animation to learn how a number line can be used to solve subtraction questions with positive and negative whole numbers.

Completing this activity should take approximately 5 minutes.

• Explanation: CK-12: Shannon Newman’s “Subtracting Integers” Link: CK-12: Shannon Newman’s “Subtracting Integers” (PDF)

Instructions: Read “Subtracting Integers” to learn how adding can be used to solve subtraction questions with positive and negative whole numbers. Watch the video from Khan Academy and then solve the 23 “Time to Practice” problems.

Completing this activity should take approximately 1 hour.

1.1.1.3 Multiplying Integers   - Explanation: CK-12: “Multiplying Integers” Link: CK-12: “Multiplying Integers” (PDF)

Instructions: Read “Multiplying Integers” to learn how the signs are used to determine the answer. Watch the first video and then complete the “Time to Practice” questions.

Completing this activity should take approximately 45 minutes.

``````-   [CCSS.Math.Content.7.NS.A.2](http://www.corestandards.org/Math/Content/7/NS/A/2)

attributed to CK-12 Foundation. The original version can be found
[here](http://www.ck12.org/section/Multiplying-Integers/).
``````
• Did I Get This? Activity: XP Math: “Integers Multiplication” Link: XP Math: “Integers Multiplication” (Flash)

Instructions: Hit the start button. You will be given 60 seconds to answer as many integer multiplication questions as you can. The answers will range from -144 to 144. Play this game three times.

Completing this activity should take approximately 10 minutes.

1.1.1.4 Dividing Integers   - Explanation: CK-12: “Dividing Integers” Link: CK-12: “Dividing Integers” (PDF)

Instructions: Read this webpage to learn how dividing integers is similar to multiplying integers. Watch the first video and then complete the “Time to Practice” questions.

Completing this activity should take approximately 45 minutes.

``````-   [CCSS.Math.Content.7.NS.A.2](http://www.corestandards.org/Math/Content/7/NS/A/2)

attributed to CK-12 Foundation. The original version can be found
[here](http://www.ck12.org/section/Dividing-Integers/).
``````

1.1.2 Operations with Signed Decimals   - Explanation: CK-12: “Positive and Negative Fraction and Decimal Comparison” Link: CK-12: “Positive and Negative Fraction and Decimal Comparison” (PDF)

Instructions: Read the article on comparing signed decimals and fractions. This reading is meant to review concepts about positive and negative rational numbers before you are asked to complete operations with the numbers. Solve the 15 practice problems at the bottom of the webpage.

Completing this activity should take approximately 30 minutes.

``````-   [CCSS.Math.Content.7.NS.A.3](http://www.corestandards.org/Math/Content/7/NS/A/3)

attributed to CK-12 Foundation. The original version can be found
[here](http://www.ck12.org/arithmetic/Positive-and-Negative-Fraction-and-Decimal-Comparison/lesson/Positive-and-Negative-Fraction-and-Decimal-Comparison/?__hstc=107423837.5c65aa60bd382096b5b470b3b31b53d6.1375210181314.1378388554828.1378395489229.64&__hssc=107423837.10.1378395489229).
``````

1.1.2.1 Adding Decimals   - Explanation: Vimeo: Jennifer Burke’s “Adding Decimals (Same as Integers)” Link: Vimeo: Jennifer Burke’s “Adding Decimals (Same as Integers)” (Flash)

Instructions: This video shows how the steps for adding positive and negative decimals are very similar to the steps for adding integers. Watch the video and write down at least one way that integer questions are similar to decimal questions and one way they are different from each other.

Completing this activity should take approximately 15 minutes.

``````-   [CCSS.Math.Content.7.NS.A.3](http://www.corestandards.org/Math/Content/7/NS/A/3)
-   [CCSS.ELA-Literacy.WHST.6-8.2.f](http://www.corestandards.org/ELA-Literacy/WHST/6-8/2/f)

displayed on the webpage above.
``````
• Checkpoint: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 5, Section 5.2: Adding and Subtracting Decimals” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 5, Section 5.2: Adding and Subtracting Decimals” (PDF)

Instructions: Review the examples on pages 363 - 364. Then go to page 366 and complete odd problems 25 - 43. You can find the answers to the problems on pages 368 - 369. Use them to check your work. Note that this checkpoint covers the material you need to know for Subunit 1.1.2.1 and Subunit 1.1.2.2.

Completing this activity should take approximately 30 minutes.

1.1.2.2 Subtracting Decimals   Note: This subunit is covered by the checkpoint assigned beneath Subunit 1.1.2.1. Focus specifically on the questions that ask you to subtract decimals.

• Explanation: Vimeo: Jennifer Burke’s “Subtracting Decimals” Link: Vimeo: Jennifer Burke’s “Subtracting Decimals” (Flash)

Instructions: Watch the video and write down how the steps are similar to the steps used to subtract integers.

Completing this activity should take approximately 15 minutes.

1.1.2.3 Multiplying Decimals   - Checkpoint: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 5, Section 5.3: Multiplying Decimals” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 5, Section 5.3: Multiplying Decimals” (PDF)

Instructions: Scroll down to page 381 and complete odd problems 29 - 47. Remember to use the signs of each number to help you determine the sign of the answer. You can find the answers to the problems on pages 384 - 385. Use them to check your work.

Completing this activity should take approximately 40 minutes.

``````-   [CCSS.Math.Content.7.NS.A.3](http://www.corestandards.org/Math/Content/7/NS/A/3)

attributed to Department of Mathematics, College of the Redwoods.
The original version can be found
[here](http://mathrev.redwoods.edu/PreAlgText/Prealgebra.pdf).
``````

1.1.2.4 “Dividing Decimals”   - Checkpoint: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 5, Section 5.4: Dividing Decimals” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 5, Section 5.4: Dividing Decimals” (PDF)

Instructions: Review the examples on page 390. Then go to page 396 to complete odd problems 41 - 63. You can find the answers to the problems on page 399. Use them to check your work.

Completing this activity should take approximately 40 minutes.

``````-   [CCSS.Math.Content.7.NS.A.3](http://www.corestandards.org/Math/Content/7/NS/A/3)

attributed to Department of Mathematics, College of the Redwoods.
The original version can be
found [here](mathrev.redwoods.edu/PreAlgText/Prealgebra.pdf).
``````

1.1.3 Operations with Signed Fractions   1.1.3.1 Adding Fractions   - Checkpoint: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 4, Section 4.4: Adding and Subtracting Fractions” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 4, Section 4.4: Adding and Subtracting Fractions” (PDF)

Instructions: Review the examples of adding and subtracting positive and negative fractions on page 283. Then go to page 287 and complete odd problems 81 - 99. You can find the answers to the problems on page 290. Use them to check your work. Note that this checkpoint covers the material you need to know for Subunit 1.1.3.1 and Subunit 1.1.3.2.

Completing this activity should take approximately 20 minutes.

``````-   [CCSS.Math.Content.7.NS.A.2](http://www.corestandards.org/Math/Content/7/NS/A/2)
-   [CCSS.Math.Content.7.NS.A.3](http://www.corestandards.org/Math/Content/7/NS/A/3)

attributed to Department of Mathematics, College of the Redwoods.
The original version can be
found [here](mathrev.redwoods.edu/PreAlgText/Prealgebra.pdf).
``````

1.1.3.2 Subtracting Fractions   Note: This subunit is covered by the checkpoint assigned beneath Subunit 1.1.3.1. Focus specifically on the questions asking you to subtract fractions.

1.1.3.3 Multiplying Fractions   - Checkpoint: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 4, Section 4.5: Multiplying and Dividing Mixed Fractions” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 4, Section 4.5: Multiplying and Dividing Mixed Fractions” (PDF)

Instructions: Review the examples of multiplying and dividing fractions on pages 295 - 296. Then go to page 298 and complete odd problems 29 - 61. The answers can be found on page 300. Use them to check your work. Note that this checkpoint covers the material you need to know for Subunit 1.1.3.3 and Subunit 1.1.3.4.

Completing this activity should take approximately 1 hour.

``````-   [CCSS.Math.Content.7.NS.A.3](http://www.corestandards.org/Math/Content/7/NS/A/3)

attributed to Department of Mathematics, College of the Redwoods.
The original version can be
found [here](mathrev.redwoods.edu/PreAlgText/Prealgebra.pdf).
``````

1.1.3.4 Dividing Fractions   Note: This subunit is covered by the checkpoint assigned beneath Subunit 1.1.3.3. Focus specifically on odd problems 49 - 61 that ask you to divide fractions.

1.1.3.5 Computing Complex Fractions   - Checkpoint: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 4, Section 4.7: Order of Operations with Fractions: Complex Fractions” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 4, Section 4.7: Order of Operations with Fractions: Complex Fractions” (PDF)

Instructions: Review pages 315 - 317, which explain the meaning of complex fractions and show the steps for several examples. Then go to page 323 and complete odd problems 57 - 67 to try your hand at working with complex fractions. The answers can be found on page 325. Use them to check your work.

Completing this activity should take approximately 30 minutes.

``````-   [CCSS.Math.Content.7.NS.A.3](http://www.corestandards.org/Math/Content/7/NS/A/3)

attributed to Department of Mathematics, College of the Redwoods.
The original version can be
found [here](mathrev.redwoods.edu/PreAlgText/Prealgebra.pdf).
``````
• Did I Get This? Activity: Howard County Public School System: “Triple Triumph” Link: Howard County Public School System: “Triple Triumph” (HTML)

Instructions: Scroll down to the task for 7.NS.3 entitled “Triple Triumph.” Then click to download the activity. You will use the skills you have been practicing with all types of rational numbers to complete the puzzle.

Completing this activity should take approximately 30 minutes.

Note for Educators: This link will bring you to several lessons and other activities specifically created for the classroom and directly aligned to the Common Core State Standards.

1.2 Percentages   Rational numbers have many uses in real-life applications. One of the most obvious examples would be money and percentages. Throughout the second half of this unit, you will be looking at how decimals, fractions, and percentages are related to each other. Then you will use the different types of numbers to work on examples of these real-life applications, which include calculating prices after discounts, after adding a tip or gratuity, or even after you add on the sales tax, just to name a few examples.

1.2.1 Writing Percentages as a Decimal   1.2.1.1 Percentages between 1 and 100   - Explanation: CK-12: “Percents as Decimals” Link: CK-12: “Percents as Decimals” (PDF)

Instructions: Read “Percents as Decimals” to learn how you can move the decimal point back and forth to convert. Watch the Khan Academy video and then solve the 15 practice problems at the bottom of the page.

Completing this activity should take approximately 30 minutes.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

is attributed to CK-12 Foundation and the video is attributed to
Khan Academy. The original version can be found
[here](http://www.ck12.org/arithmetic/Percents-as-Decimals/lesson/Percents-as-Decimals/).
``````
• Checkpoint: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 7, Section 7.1: Percent, Decimals, Fractions” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 7, Section 7.1: Percent, Decimals, Fractions” (PDF)

Instructions: Scroll down to page 508 and complete odd problems 19 - 43, which will help you practice changing a percentage to a decimal. The answers can be found on page 511. Use them to check your work.

Completing this activity should take approximately 20 minutes.

1.2.1.2 Percentages Less than 1 and Greater than 100   - Explanation: CK-12: “Small and Large Percents as Decimals” Link: CK-12: “Small and Large Percents as Decimals” (PDF)

Instructions: Read “Small and Large Percents as Decimals” to learn how numbers over 100% can be written as decimals. Then complete the 15 practice questions at the bottom of the page.

Completing this activity should take approximately 25 minutes.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

attributed to CK-12 Foundation. The original version can be found
[here](http://www.ck12.org/arithmetic/Small-and-Large-Percents-as-Decimals/lesson/Small-and-Large-Percents-as-Decimals/).
``````

1.2.2 Writing Percentages as Fractions   - Explanation: CK-12: “Percents as Fractions” Link: CK-12: “Percents as Fractions” (PDF)

Instructions: Read “Percents as Fractions” to learn how using 100ths can help convert percentages to fractions and fractions to percentages. You do not need to view the review videos. Then solve the 16 practice problems at the bottom of the page.

Completing this activity should take approximately 30 minutes.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

attributed to CK-12 Foundation. The original version can be found
[here](http://www.ck12.org/arithmetic/Percents-as-Fractions/lesson/Percents-as-Fractions/).
``````
• Checkpoint: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 7, Section 7.1: Percent, Decimals, Fractions” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 7, Section 7.1: Percent, Decimals, Fractions” (PDF)

Instructions: Scroll down to pages 508 - 509 and complete odd problems 1 - 17 and 51 - 67, where you can try your hand at changing a percentage to a fraction. The answers can be found on pages 510 -

1. Use them to check your work.

Completing this activity should take approximately 15 minutes.

2. CCSS.Math.Content.7.RP.A.3

1.2.3 Relating Fractions, Decimals, and Percentages   - Explanation: CK-12: “Conversion of Decimals, Fractions, and Percents” Link: CK-12: “Conversion of Decimals, Fractions, and Percents” (PDF)

Instructions: Watch the first two videos and then read through the article to see how to put all of the conversions together. You will learn how to change back and forth from all three types of numbers. Finally, solve the 20 practice problems at the bottom of the page.

Completing this activity should take approximately 1 hour.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

attributed to CK-12 Foundation. The original version can be found
[here](http://www.ck12.org/concept/Conversion-of-Decimals-Fractions-and-Percent---Intermediate/?ref=%2Fconcept%2FConversion-of-Decimals-Fractions-and-Percent%2F).
``````

1.2.4 Percentage Word Problems   - Explanation: CK-12: “Solving Ratio and Percent Problems Using Proportional Reasoning” Link: CK-12: “Solving Ratio and Percent Problems Using Proportional Reasoning” (PDF)

Instructions: Read through the different types of word problems that percentages can be used to solve. For each example in the reading, try the problem on your own paper before scrolling through to see the answer. There are nine examples to try while reading through the article.

Completing this activity should take approximately 1 hour.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

attributed to CK-12 Foundation. The original version can be found
[here](http://www.ck12.org/na/Solving-Ratio-and-Percent-Problems-Using-Proportional-Relationships---7.RP.3-1/lesson/user%3Ac2ZveDJAb3N3ZWdvLm9yZw../Solving-Ratio-and-Percent-Problems-Using-Proportional-Relationships---7.RP.3/).
``````
• Explanation: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 7, Section 7.3: General Applications of Percent” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 7, Section 7.3: General Applications of Percent” (PDF)

Instructions: Read page 521 to learn about solving world problems that involve percentages. Then complete odd problems 1 - 23 on pages 525 - 527. The answers can be found on page 528. Use them to check your work.

Completing this activity should take approximately 45 minutes.

1.2.4.1 Sales Tax   - Explanation: CK-12: “Prices Involving Sales Tax” Link: CK-12: “Prices Involving Sales Tax” (PDF)

Instructions: Read “Prices Involving Sales Tax” to see how the price of an item changes once the tax has been added to it. Then solve the first 10 practice problems at the bottom of the page.

Completing this activity should take approximately 30 minutes.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

attributed to CK-12 Foundation. The original version can be found
[here](http://www.ck12.org/arithmetic/Prices-Involving-Sales-Tax/lesson/Prices-Involving-Sales-Tax/).
``````
• Explanation: CK-12: “Prices Involving Discounts” Link: CK-12: “Prices Involving Discounts” (PDF)

Instructions: Now that you have seen how a price increases with tax, check out how a price can become lower after a discount (sale or coupon) is applied. Then solve the 15 practice problems at the bottom of the page.

Completing this activity should take approximately 45 minutes.

1.2.4.2 Gratuities   - Explanation: CK-12: “Prices Involving Sales Tax” Link: CK-12: “Prices Involving Sales Tax” (PDF)

Instructions: Although the title mentions sales tax, the article is really about calculating the tip that you should leave for services, like when you go out for a meal at a restaurant. Check out how the steps are similar to finding the new price after sales tax has been added. Then solve the 15 practice problems at the bottom of the page.

Completing this activity should take approximately 45 minutes.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

attributed to CK-12 Foundation. The original version can be found
``````

1.2.4.3 Simple Interest   - Explanation: CK-12: “Simple Interest” Link: CK-12: “Simple Interest” (PDF)

Explanation: As you read through the article on simple interest, try to come up with some examples of where you might be able to apply this lesson in real life. Then solve the 15 practice problems at the bottom of the page.

Completing this activity should take approximately 1 hour.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

attributed to CK-12 Foundation. The original version can be found
``````

1.2.4.4 Percentage Increase and Decrease   - Explanation: CK-12: “Percent of Increase” Link: CK-12: “Percent of Increase” (PDF)

Instructions: This article will show you how to calculate the percentage when an amount increases. As you read through the article, think about how you could use the steps to calculate the percentage increase when measuring your height from one year to the next. Then complete the 15 practice questions at the bottom of the page.

Completing this activity should take approximately 45 minutes.

``````-   [CCSS.Math.Content.7.RP.A.3](http://www.corestandards.org/Math/Content/7/RP/A/3)

attributed to CK-12 Foundation. The original version can be accessed
[here](http://www.ck12.org/arithmetic/Percent-of-Increase/lesson/Percent-of-Increase/).
``````
• Explanation: CK-12: “Percent of Decrease” Link: CK-12: “Percent of Decrease” (PDF)

Instructions: As you read through the article on the percentage of decrease, write down at least one way that the steps are similar to finding the percentage of increase. Then complete the 15 practice questions at the bottom of the page.

Completing this activity should take approximately 45 minutes.

• Assessment: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 7, Section 7.4: Percent Increase and Decrease” Link: Department of Mathematics, College of the Redwoods: Prealgebra Textbook, 2nd edition: “Chapter 7, Section 7.4: Percent Increase and Decrease” (PDF)

Instructions: Use what you have learned in the two previous readings to complete odd problems 1 - 15 on page 538. There are examples on pages 529 - 534 if you would like to refer back to them. The answers can be found on page 541. Use them to check your work.

Completing this activity should take approximately 20 minutes.

• Did I Get This? Activity: Howard County Public School System: “7th Grade Dance” Link: Howard County Public School System: “7th Grade Dance” (HTML)

Instructions: Scroll down to the task for 7.RP.A.3 entitled “7th Grade Dance.” Then click to download the activity. You will use your knowledge from the second half of the unit to complete the task on costs for the seventh-grade dance.

Completing this activity should take approximately 30 minutes.