# ALEX Classroom Resources

ALEX Classroom Resources
Subject: Mathematics (7)
Title: Grade 7 Mathematics Module 4, Topic B: Percent Problems Including More Than One Whole
Description:

In Topic B, students create algebraic representations and apply their understanding of percent from Topic A to interpret and solve multi-step word problems related to markups or markdowns, simple interest, sales tax, commissions, fees, and percent error. They apply their understanding of proportional relationships from Module 1, creating an equation, graph, or table to model a tax or commission rate that is represented as a percent. Students solve problems related to changing percents and use their understanding of percent and proportional relationships to solve the following:  A soccer league has 300 players, 60% of whom are boys.  If some of the boys switch to baseball, leaving only 52% of the soccer players as boys, how many players remain in the soccer league?  Students determine that, initially, 100% = 60% = 40% of the players are girls and 40% of 300 equals 120.  Then, after some boys switched to baseball, 100% - 52% of the soccer players are girls, so 0.48p = 120, or p = 120/0.48.  Therefore, there are now 250 players in the soccer league.

In Topic B, students also apply their understanding of absolute value from Module 2 when solving percent error problems. To determine the percent error for an estimated concert attendance of 5,000 people, when actually 6,372 people attended, students calculate the percent error as (|5000 - 6372|)/|6372|, which is about 21.5%.

Subject: Mathematics (6 - 7)
Title: The Lowdown | Interpret Data With Graphs, Percents, Rate and Ratio: California Agriculture in a State of Drought
URL: https://aptv.pbslearningmedia.org/resource/mkqed.math.rp.parched/interpret-data-with-graphs-percents-rate-and-ratio-california-agriculture-in-a-state-of-drought/
Description:

In this infographic, learn about the impact of drought on agriculture in California. In the accompanying classroom activity, students use the information on one of the infographic graphs to compare the share of production value to the share of water usage for different crops and consider the implications for the choice of crops to grow in times of drought. To get the most from this lesson, students should be comfortable interpreting percentages and double bar graphs and familiar with ratios and rates.

Subject: Mathematics (7)
Title: What's My Interest?
Description:

In this lesson, students will explore the concept of interest by means of two activities. The first, a simple activity with jellybeans, introduces the concept of interest accruement, and the second, a practical, "real world" activity, reinforces the concept and places it into a larger context. This lesson will help students learn about compound interests and give them real-world practice in making these calculations.

Subject: Mathematics (7)
Title: A Penny Saved Is a Penny Earned…With Interest
Description:

In this economics and personal finance lesson plan, students will make decisions about saving and spending. Students will practice calculating interest and creating a budget to practice their mathematics and financial literacy skills.

Subject: Mathematics (7)
Title: KutaSoftware: Algebra 1 - Percent of Change Part 1
Description:

This YouTube video will help explain how to teach the percent of change using a worksheet from Kuta Software. Kuta Software is free software for math teachers that creates worksheets in a matter of minutes. There are a series of three videos available to fully teach this concept. The videos are labeled Percent of Change Part 1, Percent of Change Part 2, and Percent of Change Part 3. This video can be played to introduce a lesson on the percent of change. This video is 10 minutes and 36 seconds in length.

Subject: Mathematics (7)
Title: KutaSoftware: Algebra 1 - Percent of Change Part 2
Description:

This YouTube video will help explain how to teach percent of change using a worksheet from Kuta Software. Kuta Software is free software for math teachers that creates worksheets in a matter of minutes. There are a series of three videos available to fully teach this concept. The videos are labeled Percent of Change Part 1, Percent of Change Part 2, and Percent of Change Part 3. This video can be played as a continuation of a lesson on the percent of change. This video is 9 minutes and 57 seconds in length.

Subject: Mathematics (7)
Title: KutaSoftware: Algebra 1 - Percent of Change Part 3