Volume Purchase Program for Education

The Volume Purchase Program allows educational institutions to purchase apps and books in volume and distribute them to students, teachers, administrators, and other employees.* The program also allows app developers to offer special pricing for purchases of 20 apps or more.

Purchase Details

Left-to-Right Subtraction
Left-to-Right Subtraction by Esa Helttula
$3.99 ea. (1-19 units) $1.99 ea. (20+ units)

Distribution Type

Review Order Books cannot be revoked after they are assigned.
To assign apps or books to users, users must be on devices with iOS 7 or later or OS X 10.9 or later installed. To assign apps to devices, devices must have iOS 9 or later or OS X 10.11 or later installed.
Left-to-Right Subtraction
Left-to-Right Subtraction by Esa Helttula
plus tax, where applicable

Distribution Type: Redeemable Codes

You will be notified by email once your order has been processed. You will also receive an email receipt showing any applicable taxes. You can check on the status of your order at any time in Purchase History on your Account Information page.

Distribution Type: Managed Distribution

Assign apps by using a Mobile Device Management (MDM) solution, such as the latest version of Apple Profile Manager. You retain ownership of apps only, allowing you to revoke and reassign them as needed. Learn More

You will be notified by email once your order has been processed. You can check the status of your order at any time in your Purchase History.

Distribution Type: Managed Distribution

Assign books to users on iOS 7 or later or on OS X 10.9 or later using a Mobile Device Management (MDM) solution, such as the latest version of Apple Profile Manager. Book assignments are permanent, and cannot be revoked or reassigned. Learn More

You will be notified by email once your order has been processed. You can check the status of your order at any time in your Purchase History.

Place Order Cancel Books cannot be revoked after they are assigned.

Left-to-Right Subtraction

By Esa Helttula

Description

This math app can be used to teach and study the left-to-right subtraction method. The app is easy to use and it has an intuitive interactive interface with customizable colors and other settings. The user can solve random subtraction problems and each step is made clearer with an animation.

The Left-to-right Subtraction Method

The left-to-right subtraction method is a two-step process. In the example 936 - 581, the number to be subtracted is first written in an expanded form: 500+80+1. Each of the parts is then subtracted from the starting number. In our example 936-500=436, 436-80=356 and finally 356-1=355.

In the Everyday Mathematics curriculum the left-to-right subtraction method is one of the algorithms for subtraction.

Endorsed by teachers

Rita Zeni, Ecole Sandy Hill Elementary, 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.
They also provide individualized feedback to each student, with an immediacy that is not always possible through pencil and paper practice. Being able to adjust the level of difficulty to suit their needs is also very motivating for the students. I am so glad to have come across this great educational tool!"

The App is Easy to Use

Each step of the multi-step process is animated and the numbers are aligned automatically so that the user can concentrate on solving the operations for each step.

After you solve each sub-operation the correct answer will fly to the right place. If you press the wrong button the answer will appear above the keyboard but it will not move.

Settings:

- The numbers can have 2 or 3 digits.
- 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.
- Open worksheets of up to 10 problems that are made on the iDevBooks.com site

Other iDevBooks math apps

iDevBooks math apps have been reviewed and endorsed by Wired.com, IEAR.org, Edudemic.com, Teachers with Apps, and other respected sites and organizations.

Some of the other 24 iDevBooks math apps are Column Addition, Long Multiplication, Long Division, Column Subtraction, Visual Multiplication Table, Partial Differences Subtraction, Partial Products Multiplication, Partial Sums Addition, Decimal Rounding, etc.

Feedback and requests for new features

New ideas to make this app better are welcome. Please visit idevbooks.com to give feedback.

Privacy

This app has no ads or in-app purchases and it does not transmit any data during the operation of the app. This app also does not contain any links to other apps or the web.

What's New in Version 5.0

- open worksheets from app (new worksheets can be made on the iDevBooks.com site)
- support for iOS 10.0
- support for shared iPad in school environments

For more information about worksheets and other new features of this version please visit idevbooks.com. Please also get in contact if you have any feedback or you want information about 32 iDevBooks math apps.

Screenshots

iPhone Screenshot 1
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iPad Screenshot 1
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iPad Screenshot 5
Left-to-Right Subtraction
View in iTunes
This app is designed for both iPhone and iPad
  • $3.99 ea. (1-19 units)
    $1.99 ea. (20+ units)
  • Category: Education
  • Updated:
  • Version: 5.0
  • Size: 3.0 MB
  • Language: English
  • Seller:
Rated 4+
  • Made for Ages 9–11

Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

Device-Assignable
Optimized for Shared iPad

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.