Partial Sums Addition

for iPad, iPhone, and Windows 10 PCs

This app can be used to teach and study the partial sums addition 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 addition problems with small and large numbers. The number of digits in the numbers can be set.

The Partial Sums Addition Method

The partial sums addition method is a two-step process. In the example 764 + 340, each place value is first added separately from left to right. The resulting addition 1000 + 100 + 4 produces the answer 1104.

In the Everyday Mathematics curriculum the partial sums method is the focus algorithm for addition.

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.


  • Each number can have from 2 to 3 digits.
  • Problems can be custom or random.
  • There can be 2 or 3 numbers to add.
  • 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 interfaces for iPad and iPhone.

Partial Sums Addition Videos

Partial sums addition with three two digit numbers

87 + 33 + 15



Partial sums addition with two three digit numbers

681 + 588


Partial Sums Addition 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.

Partial Sums Addition in the VPP store