Grid Multiplication 1.1 Math App for iPhone Teaches the Grid Method

January 17, 2011 in Education (E)

[] Espoo, Finland - Independent developer Esa Helttula today is pleased to introduce Grid Multiplication 1.1, the 18th of his math instruction apps for the iPhone, iPod touch, and iPad. The Grid Multiplication math app can be used to teach and study the grid multiplication method. The app is easy to use and it has an intuitive interactive interface with customizable colors and other settings. As all math apps by Esa Helttula, Grid Multiplication is also suitable for special education students.

Part of a Set of 18 Math Apps:
Wired called them "A Set of Excellent iPhone Math Apps for the Older Child". All 18 math apps by Esa Helttula are used by schools worldwide.

Teacher Endorsements:
Z. R. Prowell, Edina, Minnesota, USA: " There are students who see my examples who still need some guidance, and after using the app have said, "Now I get it." The feature of selecting possible solutions in each step helps some of my students who are still building their multiplication facts."

R. Zeni, Abbotsford, BC, Canada: "The math apps by Esa Helttula allow students to practice and reinforce the specific computation strategies taught in class, with as much or as little scaffolding as necessary. I am so glad to have come across this great educational tool!"

J. Bryson, Kings Mountain, North Carolina, USA: "They seem to think we - as teachers don't know how to do math - but when they see the app solve it the same way we told them - it reinforces what we have been trying to teach them."

All Apps by Esa Helttula are Suitable for Special Education

Special education teachers use apps by Esa Helttula because they have some key characteristics that make them suitable also for special education students. The apps have no timers, no punishments for wrong answers and the interface is clean without any distractions.

Tim Pelton, professor of Mathematics Education, wrote in his 'Tap Tap Math' blog about the Column Subtraction app: "With the 'show current operation' option turned on, they are constantly reminded of the next step, which can lead to efficient practice of the procedure. Then by turning off the current operation your child is able to practice remembering the steps on his/her own. 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. However, to support learning and understanding in mathematics you need to take an active role in assessing understanding and challenging your child to explain their thinking." All apps by Esa Helttula use the same basic principles that professor Pelton describes.

The Grid Multiplication Method:
The grid multiplication method is a two-step process. In the example 39 x 24 the numbers are first broken up into 30 9 and 20 4, and written on a grid. Multiplying the row and column headers then solves each cell of the grid. Eventually the partial products 600, 180, 120, and 36 are added together.

The grid method differs from the traditional long multiplication by clearly breaking the multiplication and addition into two steps. It is also less dependent on place value.

The grid multiplication method has become increasingly common in primary schools in England. It is less efficient than the traditional long multiplication method, but children are less likely to make mistakes with grid multiplication. Because of pocket calculators, efficiency is today less important than understanding. Grid multiplication is also more explicit and memorable than the traditional method.

The App is Easy to Use:
The numbers are aligned automatically so that the user can concentrate on solving the operations for each column.
After the user solves the operation for each partial product the correct answer will fly to the right place in the grid. If the user presses the wrong button the answer will appear above the keyboard but it will not move.

Feature Highlights:
* Each number can have 2 or 3 digits
* Random and custom problems
* The current operation 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, iPod touch, or iPad
* iPhone OS 3.0 or later
* 0.6 MB

Pricing and Availability:
Grid Multiplication 1.1 is only $3.99 (USD) and available worldwide exclusively through the App Store in the Education category. Review copies are available upon request.

Esa Helttula is an independent developer located in Espoo, Finland. He specializes in apps for the iPhone OS that help teach math skills. He is formerly an algorithm visualization researcher at the university of Tampere in Finland. Unable to find a suitable app to help teach his daughter addition, he created his first iPhone app, Column Addition. Fraction Math marks his fourteenth iPhone app. Copyright (C) 2011 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.