Wednesday, February 8, 2012

Saving the Sports Complex Algebra Project

Posted by David Wetzel


An algebra project focusing on a theme which interests students is more likely to engage them in the project, so lets take a look at sports. Many students participate in sports at some level, whether as part of a school team or a community team.

For the most part these same students do not understand the costs involved to host the sport. Also, they do not understand how much money is needed to ensure a profitable season so the sport can continue from year to year.

Sports Complex Project

This project is designed for using algebra as a basis for comparing expenses and income at a youth athletic complex to determine profitability.

Math students need to decide which fund raising activities will help their sports complex remain profitable.

The sports complex is not making enough money this year from concession stand sales to keep the complex open the last two months of this year’s sports season. The committee overseeing the sports complex project a $1,000.00 shortfall in funds to pay for lights, grass cutting, and maintenance.

Some members of the committee want to start a charging a $1.00 admission fee to everyone who enters the complex, this includes all fans and participants.

After much debate, the sports complex committee have decided to hold a carnival to avoid charging an admission fee. They also decided on the following two options for charging admission and ticket prices for the carnival.

  • Option 1:  $1.00 admission and $.25 per ticket.
  • Option 2:  no admission and $.50 per ticket.

Problem

Which of these two options will help raise enough money to avoid charging admission to everyone who uses the sports complex?

Facts needed to solve the problem:

  • The sports complex committee has limited expenses to $600.00.
  • An inflatable bungee run costs $250.00 to rent for rent for one day.
  • A dunk tank costs $100.00 to rent for one day.
  • A cotton candy machine costs $50.00 to rent for one day.
  • An inflatable slide costs $100.00 to rent for one day.


Solving the Problem Complete the following to solve the problem. List at least 10 activities, including food booths, games, and rides. Other possibilities include food donations and activities which can be easily made such as a softball toss, soccer kick contest, baseball toss, basketball toss, or football toss.

Use Bubbl.us mapping software to create a organizational map to help solve the problem. Use the following as a guideline for solving the problem:

  • For each option listed above, write equations to find the profit  “y” of selling “x” tickets.
  • What is the profit or loss for ticket sales based on attendance of 200 people, 300 people, and 400 people?
  • Graph the equations.
  • At what point, if any,  will Option 1 and Option 2 be equal?
  • Which option is the best for solving the problem and ensuring at least a $1,000.00 profit?

Alternative Solution

If Option 1 or Option 2 will not raise enough money to cover expenses and ensure enough profit to avoid an admission fee to the sports complex for everyone, what option to recommend to the sports complex committee to ensure the carnival raises enough money?

Survey

Create a survey using Google Docs Survey which which will be used to obtain a rough estimate of the number of people who will attend the carnival.

Presentation

Present your findings and recommendations to your classmates using one of the two following methods:

  • Present your findings to you class using Google Docs Presentation.
  • post your findings on the class Wiki for your class to view and parents can see. Ask for feedback and recommendations from all those who few your project findings on the class Wiki.

Project based learning in algebra allows students to transfer math knowledge to situations outside the classroom. Also the use of projects is often a motivational factor for students to learn algebra, as opposed to considering algebra as something they will never use in their lives.

Additional Readings on Project Based Learning in Math

Teaching Algebra: making Real World Connections

Solving Weaknesses in Math Using Project Based Learning

Pythagorean Theorem: Using Real World Applications

Pythagorean Theorem - Real World Application

Posted by David Wetzel

Pythagoream's Theorem

Pythagorean Theorem

The Pythagorean Theorem is used any time you have a right triangle in which you know the length of two sides and want to find the third side.

The formula is: a2 + b2 = c2

There are many strategies for getting students to learn how to solve a problem related to this theorem. Many of these problems are boring, procedural driven, and lacking in connection to real world applications.

In the view of many this is often necessary because they do not have the time to teach it any other way. Curriculum, testing, and No Child Left Behind pressures cause these views.

However, there are other strategies to teach the same concept and yet make it more interesting for students. The critical aspect of this strategy is to make connections to their world.

Students always ask:

  • When will I every use the Pythagorean Theorem?
  • Why do need to learn this? It is boring!

The answer is, in any kind of job that deals with triangles. For example, carpenters, engineers, architects, construction workers, those who measure and mark land, artists, and designers of many sorts need to know it.

Problem Solving Application

The following are problem is more interesting and designed to find the length of a2 and b2, when only c2 is known.

Shopping for a New TV

Jacob and Denise, brother and sister, are trying to get their parents to buy them a new TV. Their parents have agreed; however, they are limited to a size 32 inch TV.

Now they must go shopping to find the one they want. At their local electronics store, they discover that 42 inch TVs come in a lot shapes and sizes.

This does not seem to make since, until the salesman tells that 42 inches is diagonal measurement that is the normal way of sizing TVs.

They decide to compare the difference between a 32 inch standard TV and 32 inch flat screen HDTV. Jacob and Denise both agreed that they should buy the TV with greatest viewing area.

After looking a both TV types, they predicted that the flat screen HD TV had the greatest viewing area.

How would you determine which TV has the greatest viewing area?

Answer

TV Problem: the key to this problem is the aspect ratio of the TVs. The Standard TV has an aspect ratio of 4:3, while the Flat Screen HDTV has an aspect ratio of 21:9.

First they must find out what each unit equals (for example in the Standard TV is 4 units wide and 3 units high - aspect ration 4:3) in the aspect ratio for each TV by using the Pythagorean Theorem.

Next they must find the area of each TV using A = w x h.

Standard TV Area = 491.56 in2

Flat Screen HD TV Area = 370.44 in2

Jacob and Denise now must decide which TV they really want, because their prediction was wrong.

——

This problem not only makes connections to something that students are actually interested in, they also make connections to other math concepts. Pythagorean Theorem now has a real world application to students and they will see its value.

You may also find these posts helpful:

Three Project-Based Learning Math Activities

Seven Bridges