# Subtraction Concentrated > Educational app for practicing subtraction with customizable visual aids. (iPhone/iPad app by Catherine Vitti.) - Source: https://appshunter.io/ios/app/subtraction-concentrated/id880312807 (this page in markdown: same URL + `.md`) - Developer: [Catherine Vitti](https://appshunter.io/developer/548958377) - Category: Education, Games - Price: $0.99 - Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 12.0 · 2 MB - Languages: American English - Released: 2014-05-31 - Data updated: 2026-08-31 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/subtraction-concentrated/id880312807/reviews.md ## What is Subtraction Concentrated? Practice solving subtraction problems of one-digit to five-digit numerals. Work column-by-column or by doing the math in your head and selecting from multiple choices. Proper borrowing is enforced in the column-by-column mode. You can display the borrowing in multiple-choice mode as a "helpful hint." Five background color choices, including white-on-black (with no grayscale) for users with mild visual impairment. Ideal for the classroom iPad, where the large numerals allow for demonstrations to a group or for team-based practices. There are no ads, no in-app purchase, no interruptions, distracting sounds or music. This was designed for an instructional setting. ## Key features - One-digit to five-digit subtraction practice - Column-by-column calculation with borrowing - Mental math with multiple-choice answers - Visual borrowing hints - Customizable background colors - Classroom iPad friendly ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/subtraction-concentrated/id880312807/reviews.md ### 5/5 — Helpful App *2014-06-01* Great app for practicing subtraction skills. You can set the preferences for number of digits so you can control the level of difficulty. Another nice feature is changing the background color of the app. ## Frequently asked questions about Subtraction Concentrated ### What kind of subtraction problems does Subtraction Concentrated offer? Subtraction Concentrated allows users to practice subtraction problems ranging from one-digit to five-digit numerals. This includes options for both column-by-column calculation and mental math with multiple-choice selections. ### Does Subtraction Concentrated have ads or in-app purchases? No, Subtraction Concentrated is designed for an instructional setting and contains no advertisements, no in-app purchases, and no distracting sounds or music. ### What are the visual customization options in Subtraction Concentrated? The app provides five different background color choices, including a white-on-black option without grayscale. This feature is beneficial for users with mild visual impairments. ### How does Subtraction Concentrated handle borrowing in subtraction? In the column-by-column mode, proper borrowing is strictly enforced. Users can also display the borrowing process as a 'helpful hint' when using the multiple-choice mode. ### Is Subtraction Concentrated suitable for classroom use? Yes, Subtraction Concentrated is ideal for classroom iPads due to its large numerals, which facilitate group demonstrations and team-based practices. It is designed to be an interruption-free learning tool. ### What devices is Subtraction Concentrated available on? Subtraction Concentrated is available on iPhone, iPad, and iPod touch devices. It is designed to be accessible across Apple's mobile ecosystem. ### How often is Subtraction Concentrated updated? The latest version of Subtraction Concentrated is 3.1.0, which was last updated on April 27, 2023. The app is generally stable and receives occasional updates. ### What is the age rating for Subtraction Concentrated? Subtraction Concentrated has an age rating of 4+. This indicates it is suitable for children aged four and above, making it appropriate for early elementary education. ## Version history (last 4 releases) ### 3.1.0 — 2023-04-27 Minor layout changes. Additional background colors. ### 3.0.2 — 2019-12-30 Updated for iOS 13 ### 2.0.3 — 2017-05-25 Updates for iOS 10 Minor changes to background colors, buttons, and the layout for 12.9" display. ### 1.0.1 — 2014-05-31 No release notes. ## Apps similar to Subtraction Concentrated | App | Rating | Price | Category | | --- | --- | --- | --- | | [ElevateScience 6-8 Vocab](https://appshunter.io/ios/app/elevatescience-6-8-vocab/id1331644205) | 2.6 (8) | Free | Education | | [Young Adult - Comet Spelling](https://appshunter.io/ios/app/young-adult-comet-spelling/id1195253573) | 5.0 (2) | $3.99 | Education | | [Math Quiz - Train Your Brain](https://appshunter.io/ios/app/math-quiz-train-your-brain/id6742830684) | — | Free | Education | | [AirTime Learning](https://appshunter.io/ios/app/airtime-learning/id1474865203) | 5.0 (2) | Free | Education | | [Times Alive](https://appshunter.io/ios/app/times-alive/id1436641502) | 4.6 (153) | $14.99 | Education | | [Long Addition & Subtraction](https://appshunter.io/ios/app/long-addition-and-subtraction/id6452048494) | 5.0 (1) | Free | Education | ## More apps by Catherine Vitti - [Addition Concentrated](https://appshunter.io/ios/app/addition-concentrated/id548958374) - [Fraction-O-Meter](https://appshunter.io/ios/app/fraction-o-meter/id914099276) All apps by Catherine Vitti: https://appshunter.io/developer/548958377 --- *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 2026-08-31.*