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   MATH TOOLS NEWSLETTER - August 19, 2011 - No. 100

We are reaching a milestone with this issue -- it is our
one hundredth issue!

As the school year begins, we are reflecting on the Problems of
the Week. If you've never tried the PoWs before, take them for
a spin free for 21 days with a trial account:

The Math Forum is a community affair and some of our members
are planning new projects and ways to involve their students in
problem solving. As a result, we are considering possible
innovations and also planning how to provide more effective
service in the future.

Here's a chance to open some new opportunities for your
students and help the community by completing a brief survey:


Your quick response will help us with any changes for the
upcoming school year, but we welcome your thoughts,
suggestions, and questions at any time.

Since writing all-new software to power our PoWs two years ago,
we've rolled out additional features every month. Many of these
updates improve operations behind-the-scenes. For the most
visible changes, check out

If you are a subscriber but your subscription has expired, please
consider renewing:



As you browse the catalog, please take a moment to rate a
resource, comment on it, review it -- join an existing
conversation, or start a new discussion!

Tool: Sketchpad Explorer
KCP Technologies, Inc.
The multitouch interface of the Sketchpad Explorer app lets you
interact with, and investigate, any document created with The
Geometer's Sketchpad. Drag, manipulate and animate visual
mathematics to develop and generalize your understanding of
fundamental concepts across elementary math, geometry, algebra,
trigonometry, calculus, and beyond.

Tool: Gross Domestic Product Deflator Inflation Calculator
This is an inflation calculator for adjusting costs from one
year to another using the Gross Domestic Product (GDP) Deflator
inflation index. This inflation calculator is based on the
inflation rate during the US Government Fiscal Year, which
begins on October 1 and ends on September 30. This inflation
calculator will compute inflation from 1940 to 2009.

Tool: MathTappers: Multiples
HeavyLifters Network Ltd.
This game is designed to help learners to make sense of
multiplication and division with whole numbers, and then to
support them in developing fluency while maintaining accuracy.
Compatible with iPhone, iPod touch, and iPad. Requires
iOS 3.1.3 or later.

Tool: Everyday Mathematics Name That Number
McGraw-Hill School Education Group
This game offers a way to practice computation and order of
operations. Players use five number tiles to build number
sentences that equal a target number. Players can name the
target number by adding, subtracting, multiplying, and/or
dividing the numbers using as many tiles as possible. The
more tiles the player uses, the more points he or she earns.
There are a total of 5 rounds in a game. Visual and audio
reinforcement of correct and incorrect answers helps players
master math facts and order of operations. Compatible with
iPhone, iPod touch, and iPad. Requires iOS 3.0 or later.

Tool: Scientific Calculator graphic
Amir Rashedi
This scientific calculator with some graphing capability uses
either Cartesian or polar coordinate systems. Expressions can
include any of the following:
  - Basic algebraic operations
  - Exponential and logarithmic functions
  - Trigonometric functions and their inverses
  - Hyperbolic functions and their inverses
  - Absolute value and step functions

Tool: Stay or Switch? - The Monty Hall Problem
Jeremy Jones
Players choose one of three doors to experimentally determine
the odds of winning the grand prize behind one of the doors,
as in the TV program "Let's Make a Deal." This site provides
a variety of "explanations" and also a history of how the
problem became famous in a newspaper column by Marilyn
vos Savant in 1990.

***FEATURED Lesson Plan
Lesson Plan: Real Estate Tycoon
NCTM: Illuminations
In this year-long project, students design, "build," and "sell"
a house; after which they simulate investment of the profits
in the stock market. Along the way, students make scale
drawings, compute with fractions and decimals in various
contexts, and even solve simple equations. This lesson plan
was adapted from an article by David B. Smith, which appeared
in the September 2000 edition of Mathematics Teaching in the
Middle School.

***FEATURED TECHNOLOGY POW (Spanish and English versions)
Technology PoW: Cuantos Cubos?
Technology PoW: How Many Cubes?
Stephen Weimar and translated by Bernadette Baird-Zars and
  Johann Sarmiento
Given the front view and side view of an arrangement of cubes,
students are asked for the largest number of cubes that could
have been used to make the arrangement, as well as the smallest
number possible. A link to Space Blocks, a Java applet from the
National Library of Virtual Manipulatives, is provided to help
students think about the possible arrangements.
NOTE: A free login is required. Sign up using the link on the
login page, or use your existing KenKen or Problems of the Week
login--see this page for details:


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      The Math Forum @ Drexel -- 19 August 2011