Partial Differences Subtraction iPhone and iPod touch Math App

in Education (F)

[] Espoo, Finland - Independent developer Esa Helttula has released a new educational math app Partial Differences Subtraction 1.0 for iPhone and iPod touch. The app can be used to teach and study the partial differences subtraction method.

The Partial Differences Subtraction Method

The partial differences subtraction method is a two-step process. In the first step each place value is first subtracted separately from left to right. In the second step the partial differences are added to produce the answer. In the Everyday Mathematics curriculum the partial differences method is one of the algorithms for subtraction.

The Everyday Mathematics Curriculum

Everyday Mathematics is a new mathematics curriculum developed by the University of Chicago School Mathematics Project. In the United States over 3 million students in 185,000 classrooms are currently using Everyday Mathematics. Parents may find it hard to help their children with the "new math" and apps like the Partial Differences Subtraction can help both children and parents.

The Interface Supports Learning

If the user presses the wrong button the answer will appear above the keyboard but it will not move. "Because no wrong entries are allowed the app provides a passive form of positive reinforcement and your child will likely improve in both confidence and competence with respect to the procedure", said assistant professor of mathematics education Tim Pelton in his review of Column Subtraction, a sister app of Partial Differences Subtraction that uses the same kind of input method. The app is easy to use and it has an intuitive interface with customizable colors and other settings. The app has the following settings:

* Each number can have from 2 to 3 digits
* The current operation for each column can be hidden
* The operands of the current operation can be highlighted
* Colors of the interface can be changed
* The speed of the animations can be set

Device Requirements:
* iPhone and iPod touch
* Requires iPhone OS 3.0 or later
* 0.4 MB

Pricing and Availability:
Partial Differences Subtraction 1.0 is only $0.99 USD (or equivalent amount in other currencies) and available worldwide exclusively through the App Store in the Education category. This is a new app in a series of popular educational Everyday math apps for iPhone. My traditional mathematics apps include Long Division, Long Multiplication, Column Addition and Column Subtraction.

Esa Helttula is an independent developer in Espoo, Finland. He makes educational math apps for iPhone and iPod Touch. Copyright (C) 2010 Esa Helttula. All Rights Reserved. Apple, the Apple logo, iPhone and iPod are registered trademarks of Apple Inc. in the U.S. and/or other countries.