# Add and Subtract Intervention — Math Incremental Rehearsal > Educational app for mastering addition and subtraction math facts using incremental rehearsal. (iPhone/iPad app by I Teach Tiny Humans, LLC.) - Source: https://appshunter.io/ios/app/add-and-subtract-intervention/id1436776242 (this page in markdown: same URL + `.md`) - Developer: [I Teach Tiny Humans, LLC](https://appshunter.io/developer/1175634279) - Category: Education, Productivity - Price: $0.99 - Rating: 4.50/5 from 2 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 19 MB - Languages: English - Released: 2018-09-23 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/add-and-subtract-intervention/id1436776242/reviews.md ## What is Add and Subtract Intervention? Add and Subtract Intervention is a systematic method of teaching your student or child addition and subtraction math facts by using proven techniques with Incremental Rehearsal. This application is designed by Kindergarten and First Grade Educators at top elementary schools who have effectively used these techniques to teach many students as part of core curriculum. Now your student or child can leverage our experience to master addition and subtraction to build a strong foundation for math and problem solving. This application allows you to complete comprehensive assessments of your students' abilities in solving addition and subtraction math facts from 0 through 10. After completing assessments, you can focus interventions by selecting nine known math facts and one unknown for the student. Through incremental rehearsal, known math facts are reinforced while those not yet known are mastered. These techniques have been proven to work in many classroom and home settings. This application guides you through interventions by presenting math facts in the following order, where Z is unknown and A through I are known by the student: Z A, Z A, B, Z A, B, C, Z A, B, C, D, Z A, B, C, D, E, Z A, B, C, D, E, F, Z A, B, C, D, E, F, G, Z A, B, C, D, E, F, G, H, Z A, B, C, D, E, F, G, H, I, Z For each interaction in assessments or interventions, the facilitator records whether the student knows the math fact or not. The application tracks each and every assessment, automatically recording proficiency when the student reaches 80% for the math fact or marking as unknown if proficiency drops below the 80% threshold. Detailed reports show the following: - Percentage known by category and each number - Count of math facts learned by week - Charting of math facts learned by week compared to goal We hope this offering increases your students' abilities in mastering math basics. We gladly accept feedback and strive to provide the best products for you and those wanting to teach and learn. ## Key features - Incremental rehearsal for math facts - Addition and subtraction focus - Comprehensive assessments - Customizable interventions - Detailed progress reports - Tracking of proficiency levels ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/add-and-subtract-intervention/id1436776242/reviews.md ### 4/5 — Student Editing /Deleting *2019-09-30, version 2.0.1103* Love the app. Great program. However, wish there was a way to edit a name if and/or delete. ## Frequently asked questions about Add and Subtract Intervention ### What is Add and Subtract Intervention? Add and Subtract Intervention is an educational application designed to help children master addition and subtraction math facts through a systematic method called Incremental Rehearsal. It was developed by educators for kindergarten and first-grade students. ### How does Add and Subtract Intervention teach math facts? The app utilizes Incremental Rehearsal, a proven technique where known math facts are reinforced while unknown facts are gradually introduced and mastered. It presents math facts in a specific sequence to optimize learning. ### What kind of assessments does Add and Subtract Intervention offer? The application provides comprehensive assessments for addition and subtraction math facts from 0 through 10. It tracks student proficiency, automatically marking facts as known when 80% proficiency is reached. ### What kind of reports can I expect from Add and Subtract Intervention? Detailed reports are available, showing the percentage of math facts known by category and number, the count of math facts learned per week, and charts comparing weekly progress to goals. ### What is the price of Add and Subtract Intervention? Add and Subtract Intervention is available for a one-time purchase price of $0.99. ### What devices is Add and Subtract Intervention compatible with? Add and Subtract Intervention is compatible with iPhone, iPad, and iPod devices. ### How often is Add and Subtract Intervention updated? The latest version of Add and Subtract Intervention is 2.1.501, which was last updated on May 10, 2020. Update frequency can vary based on developer plans. ### What is the age rating for Add and Subtract Intervention? Add and Subtract Intervention has an age rating of 4+, making it suitable for young children learning basic math skills. ## Version history (last 4 releases) ### 2.1.501 — 2020-05-10 > Fixed issue where intervention was not showing the known problem at the end of the last iteration > Added challenge question for emailing student results > Support for iOS 13 and above ### 2.0.1103 — 2018-11-20 New features including: * Quick assessment functionality. Assess students over the entire list rather than by flashcard. * When reassessing a math problem, reset stats for that problem for student. * Added summary stats on the result list screen. * Added detailed stats on the result list items screen. ### 1.2.1007 — 2018-10-13 When tapping a subtraction flashcard now says "subtract" for the "-" operator. Previously did not say anything. ### 1.2.919 — 2018-09-21 No release notes. ## Apps similar to Add and Subtract Intervention | App | Rating | Price | Category | | --- | --- | --- | --- | | [Show Me Math Lite](https://appshunter.io/ios/app/show-me-math-lite/id738007119) | 2.0 (1) | Free | Education | | [Number Sense Lite](https://appshunter.io/ios/app/number-sense-lite/id1201814433) | 3.0 (1) | Free | Education | | [TouchMath Connect 1](https://appshunter.io/ios/app/touchmath-connect-1/id1528856250) | 1.3 (4) | $9.99 | Education | | [The Land of Venn - Geometric Defense](https://appshunter.io/ios/app/the-land-of-venn-geometric-defense/id878168094) | 5.0 (5) | $2.99 | Education | | [Reading Adventures EBLI Island](https://appshunter.io/ios/app/reading-adventures-ebli-island/id733163082) | 4.3 (7) | $4.99 | Education | | [ProblemScape: Value Of Xperts](https://appshunter.io/ios/app/problemscape-value-of-xperts/id1456312892) | — | Free | Education | ## More apps by I Teach Tiny Humans, LLC - [Counting Madness](https://appshunter.io/ios/app/counting-madness/id536910166) - [Backyard Phonics Adventure](https://appshunter.io/ios/app/backyard-phonics-adventure/id545116261) - [Sound It Out](https://appshunter.io/ios/app/sound-it-out/id558334203) - [Fun Sight Words](https://appshunter.io/ios/app/fun-sight-words/id563416659) - [Skip Counting](https://appshunter.io/ios/app/skip-counting/id571506346) - [Magic 10](https://appshunter.io/ios/app/magic-10/id628570386) All apps by I Teach Tiny Humans, LLC: https://appshunter.io/developer/1175634279 --- *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 2026-06-10.*