Partial Differences Subtraction for iPad & iPhone
This app can be used to teach and study the partial differences 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 custom and random subtraction problems. The number of digits in the numbers can be set.
The partial differences subtraction method
The partial differences subtraction method is a twostep process. In the example 936  580, each place value is first subtracted separately from left to right. The partial differences are added and 400  50 + 6 produces the answer 356.
In the Everyday Mathematics curriculum the partial differences method is one of the algorithms for subtraction.
Easy to use
The numbers are aligned automatically so that the user can concentrate on solving the operations for each column.
After you solve the operation for each column 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
 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.
 Custom interface for iPad and iPhone.
Partial Differences Subtraction Videos
Partial differences subtraction with two digit numbers72  27

Partial differences subtraction with five digit numbers760  327

Partial Differences Subtraction in the Apple VPP Store for Education
The Volume Purchase Program allows participating educational institutions to purchase iDevBooks math apps in volume and distribute them to students. All iDevBooks math apps offer special 50% discount for purchases of 20 apps or more for participating educational institutions.