Same-Change Subtraction

In the Same-Change Subtraction app the user can keep adding or subtracting the same amount from both numbers until the subtraction problem can be solved easily.

The same-change rules states that If you subtract or add the same number from both parts of a subtraction problem, the difference remains the same. A subtraction problem 667 – 289 is easier to solve if it is changed into 678 – 300.

Features:

• The numbers can have up to 3 digits
  You can set your own problems
  Three different themes
  Native interfaces for iPhone, and iPad

Videos

Same-Change 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.

Same-Change Subtraction in the VPP store