# Add Sub K-1

> Addition and subtraction practice tool for early elementary students. (iPhone/iPad app by Classroom Focused Software.)

- Source: https://appshunter.io/ios/app/add-sub-k-1/id486199509 (this page in markdown: same URL + `.md`)
- Developer: [Classroom Focused Software](https://appshunter.io/developer/406741679)
- Category: Education
- Price: Free
- Rating: 3.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 35 MB
- Languages: American English
- Released: 2011-12-08
- Data updated: 2026-06-02
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/add-sub-k-1/id486199509/reviews.md

## What is Add Sub K?

Part of the Math Practice Tools CFS Bundle

Practice Addition facts through 10 and Subtraction facts up to 20 minus 10.  
• Select Sums to 5, 10, 15, or 20. 
• OR adjust the addends separately for your problems in the a+b=c form. And make separate selections for the minuend and subtrahend when solving a-b=c problems.
• Display problems vertically or horizontally.

Practice Addition using three addends in the form of a+b+c=x+y or a+b+c=x. 
• A subtraction option for a-b=x-y is also provided. 

Options include showing objects when a problem is displayed, using counters to drag into place, using a 10-frame, or using marker board to help solve the problem.

## Key features

- Addition facts up to 10
- Subtraction facts up to 20
- Customizable addends
- Vertical or horizontal problems
- Visual aids (objects, counters, 10-frame)
- Marker board for solving

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/add-sub-k-1/id486199509/reviews.md

### 4/5 — Great teaching/learning tool.

*2012-09-21*

My 4yr old daughter actually enjoys this App and I love that she does. She is big on math, this app is simple and easy for her to use. I also like that you get to choose the numbers you want to work with. 

However I wish that when you hit the right answer the problem would automatically switch. Hitting the new problem button every single time is annoying. Maybe the makers can update that. 

Other then that GREAT App. Simple and easy to use.

## Frequently asked questions about Add Sub K

### What addition and subtraction skills does Add Sub K-1 cover?

Add Sub K-1 focuses on practicing addition facts up to 10 and subtraction facts up to 20. You can select specific sums or adjust addends individually for addition, and do the same for minuends and subtrahends in subtraction.

### Can I customize the math problems in Add Sub K-1?

Yes, you can customize problems by selecting sums up to 5, 10, 15, or 20. For addition, you can adjust addends separately, and for subtraction, you can adjust the minuend and subtrahend independently.

### Does Add Sub K-1 offer different ways to solve problems?

Yes, Add Sub K-1 provides several options to help solve problems. These include showing objects, using drag-and-drop counters, utilizing a 10-frame, or using an on-screen marker board.

### What devices is Add Sub K-1 available on?

Add Sub K-1 is currently supported on iPads. It is designed for tablet use to provide a larger screen for practice.

### How often is Add Sub K-1 updated?

The latest version of Add Sub K-1 is 1.6.1, which was released on October 27, 2018. The app was originally released on December 8, 2011.

### What is the age rating for Add Sub K-1?

Add Sub K-1 has an age rating of 4+. This makes it suitable for young children beginning their math education.

### Does Add Sub K-1 have ads?

No, Add Sub K-1 does not contain advertisements. It is a free application without any ad interruptions.

### What is the user rating for Add Sub K-1?

Add Sub K-1 has a user rating of 3.0 stars based on 1 rating. This indicates a mixed reception from its current user base.

## Version history (last 5 releases)

### 1.6.1 — 2018-10-27

• Updated to support iOS12 - thank you for your patience.
• A few other minor tweaks.
• As time allows, I'd enjoy hearing how you're using the app in the classroom or at home.

### 1.6.0 — 2018-03-19

Added an option to display problems in a horizontal orientation. 
 • A marker board and draggable chips are used a tools in the horizontal orientation. 
 • When working with a subtraction problem, a second tap on a chip dim it and place an "X" on it.
Added line size adjustment for marker board.
-- thanks to Joy H for ideas and suggestions to improve this app.

### 1.5.5 — 2016-09-21

Fixed a screen display problem seen when using the app under iOS 10.

### 1.5.1 — 2015-04-27

Fixed a problem when using the Red Square Counters in addition problems with addends greater than 10.

Thank you for the heads-up Lisa B and Julie D.

### 1.5.0 — 2014-07-24

• Added an option to create problems with Sums to 5; Sums 5 to 10; Sums to 10, Sums 10 to 15; Sums 15 to 20; and Sums 1 to 20.
• Changed the Settings page to make the “Sums to...” the default choice. (Selecting individual addends, minuends, and subtrahends is still available.)

• Minimized the chance of having the same problem twice in a row.

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## More apps by Classroom Focused Software

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All apps by Classroom Focused Software: https://appshunter.io/developer/406741679

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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 2026-06-02.*