Same-Change Subtraction

for iPad, iPhone, and Windows 10 PCs

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.


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


Same-Change Subtraction with 3-digit numbers

945 - 929


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