# Partial Sums Addition

> Interactive app for learning and practicing the partial sums addition method. (iPhone/iPad app by Esa Helttula.)

- Source: https://appshunter.io/ios/app/partial-sums-addition/id351022022 (this page in markdown: same URL + `.md`)
- Developer: [Esa Helttula](https://appshunter.io/developer/339440196)
- Category: Education
- Price: $3.99
- Rating: 5.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 1 MB
- Languages: American English
- Released: 2010-01-28
- Data updated: 2026-08-24
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/partial-sums-addition/id351022022/reviews.md

## What is Partial Sums Addition?

Partial Sums Addition helps students learn and practice the partial sums addition method step by step.

The app gives students a visual way to add numbers by working with each place value separately. The partial sums are then combined to find the final answer.

Students can solve randomly generated problems or enter their own addition problems. The number of digits can be adjusted for different skill levels.

The Partial Sums Method:

In the partial sums method, each place value is added separately from left to right. For example, in 764 + 340, the partial sums are 1000, 100, and 4. These are then added together to get the final answer: 1104.

Wired.com:
“Esa Helttula’s apps are all fantastic for math learning and practice, and aren’t cluttered with mini-games, incentives, or annoying music.”

Teacher endorsement:

“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.”
— R. Zeni, Ecole Sandy Hill Elementary, Abbotsford, BC, Canada

Easy to Use:

The numbers are aligned automatically so students can focus on solving each column. After the student solves the operation for each column, the correct answer moves into the right place. If the student presses the wrong button, the answer appears above the keyboard but does not move.

Features:

- Step-by-step partial sums addition practice
- Add 2 or 3 numbers
- Each number can have 2–3 digits
- Randomly generated or manually entered problems
- Current operation for each column can be hidden
- Operands of the current operation can be highlighted
- Customizable interface colors
- Adjustable animation speed
- Custom interfaces for iPhone and iPad

Other iDevBooks Math Apps:

Other iDevBooks math apps include Column Addition, Long Multiplication, Long Division, Column Subtraction, Visual Multiplication Table, Partial Differences Subtraction, Partial Products Multiplication, Partial Quotients Division, Decimal Rounding, and more.

Feedback:

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

Privacy:

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

## Key features

- Partial sums addition method teaching
- Interactive and customizable interface
- Random and custom addition problems
- Adjustable number of digits and addends
- Automatic number alignment
- Immediate feedback on answers
- Color and animation speed customization

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/partial-sums-addition/id351022022/reviews.md

### 5/5 — Another addition tool

*2016-03-03*

This uses a different method to standard column addition - and you can practice that using this developer's 'C Addition' app.  But this 'partial' method is equally valid, and my nine year old daughter took to it straight away.

### 2/5 — Boring but it works

*2012-04-06*

Not a bad teaching tool - but wicked boring!!  Where are the bells and whistles, or score keeping or SOMETHING...?!!

Should be free app - NOT worth paying for...

## Frequently asked questions about Partial Sums Addition

### What is the partial sums addition method taught in Partial Sums Addition?

The partial sums addition method is a two-step process where each place value is added separately from left to right. For example, in 764 + 340, you would add the hundreds, then the tens, then the ones, to arrive at the final sum.

### How does Partial Sums Addition help with learning?

The app provides an intuitive interactive interface with customizable settings to teach and study the partial sums addition method. It offers immediate feedback and automatically aligns numbers, allowing users to focus on solving operations.

### Can I customize the problems in Partial Sums Addition?

Yes, you can solve random addition problems or create custom ones. The number of digits in each number can be set from 2 to 3, and you can choose to add 2 or 3 numbers at a time.

### What devices is Partial Sums Addition available on?

Partial Sums Addition is available on iPhone, iPad, and iPod, offering custom interfaces for both iPhone and iPad.

### What is the age rating for Partial Sums Addition?

The app has an age rating of 4+, making it suitable for young learners and above.

### How often is Partial Sums Addition updated?

The latest version of Partial Sums Addition is 6.5, and it was last updated on October 19, 2021.

### Does Partial Sums Addition have ads?

No, Partial Sums Addition does not contain any advertisements. It is designed to be free of distractions like mini-games or annoying music.

### What makes Partial Sums Addition stand out from other math apps?

This app focuses solely on teaching and practicing the partial sums addition method without cluttering the experience with mini-games or incentives. It is endorsed by teachers for its ability to reinforce specific computation strategies and provide individualized feedback.

## Version history (last 5 releases)

### 7.0 — 2026-06-23

Updated for iOS 26 compatibility.

### 6.5 — 2021-10-19

- support for iOS 15

### 6.0 — 2019-09-30

- support for iOS 13
- new interface with support for latest iPad and iPhone models
- new theme colors

### 5.2 — 2018-11-12

- support for iOS 12
- support for iPhone Xr and Xs Max
- minor bug fixes

### 5.1 — 2018-03-21

- support for iOS 11
- support for iPhone X

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## More apps by Esa Helttula

- [Column Addition](https://appshunter.io/ios/app/column-addition/id339440193)
- [Column Subtraction](https://appshunter.io/ios/app/column-subtraction/id341040894)
- [Long Division](https://appshunter.io/ios/app/long-division/id341041204)
- [Long Multiplication](https://appshunter.io/ios/app/long-multiplication/id345037369)
- [Trade-First Subtraction](https://appshunter.io/ios/app/trade-first-subtraction/id351022585)

All apps by Esa Helttula: https://appshunter.io/developer/339440196

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*