Trade-First Subtraction 7.0 - App Store

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About Trade-First Subtraction

Trade-First Subtraction helps students learn and practice the trade-first subtraction method step by step. The app presents subtraction visually, with the numbers aligned automatically so students can focus on the...

Trade-First Subtraction helps students learn and practice the trade-first subtraction method step by step. The app presents subtraction visually, with the numbers aligned automatically so students can focus on the operations in each column. Students can solve randomly generated problems or enter their own subtraction problems, and the number of digits can be adjusted for different skill levels. The Trade-First Method Trade-first subtraction is similar to traditional column subtraction, but the regrouping is completed before the subtraction begins. The method has two stages: * First, all necessary trading, regrouping, or borrowing is completed * Then, the subtraction in each column is solved This gives the method its name: trade-first. Regrouping is animated step by step so students can see what happens. Regrouping across several columns is also supported. Easy to Use 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: * Numbers with 2-5 digits * Randomly generated or manually entered problems * Step-by-step trade-first subtraction practice * Animated regrouping * Supports regrouping across several columns * Current operation for each column can be hidden * Operands of the current operation can be highlighted * Customizable interface colors * Adjustable animation speed * Column separator lines can be hidden 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.” - Rita Zeni, Ecole Sandy Hill Elementary, Abbotsford, BC, Canada 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 Sums Addition, 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.

Version History Updated for iOS 27 compatibility. 7.0 Sep 14 - support for iOS 15 6.5 10/03/2021 - support for iOS 13 - new interface with support for latest iPad and iPhone models - new theme colors 6.0 10/03/2019 - support for iOS 12 - support for iPhone Xr and Xs Max - minor bug fixes 5.2 11/14/2018 - support for iOS 11 - support for iPhone X 5.1 03/26/2018 - open worksheets from app (new worksheets can be made on the iDevBooks.com site) - support for iOS 10.0 - support for shared iPad in school environments For more information about worksheets and other new features of this version please visit idevbooks.com. Please also get in contact if you have any feedback or you want information about 32 iDevBooks math apps. 5.0 02/15/2017 - support for iOS 10 Please visit iDevBooks.com if you have any feedback or you want information about over 30 iDevBooks math apps. 4.1 09/13/2016 - support for iOS 9.3 Please visit iDevBooks.com if you have any feedback or you want information about 26 iDevBooks math apps. 4.0 04/09/2016 - minor interface changes - new icon 3.0 09/12/2014 Interface updates for iOS 7. Please visit http://idevbooks.com if you have questions or feedback about any of the 26 iDevBooks math apps. 2.4 04/05/2014 -Trading across more than two zeros did not work in all cases. If you have any feedback please visit idevbooks.com. There are now 24 iDevBooks math apps. 2.3 07/31/2013 -The web link to support pages has been removed to prevent users from accidentally launching the browser. -There are also some minor interface changes. If you have any feedback please visit idevbooks.com. There are now 24 iDevBooks math apps. 2.2 06/20/2013 Support for iPhone 5 and iOS 6. Please visit idevbooks.com if you have feedback. 2.1 10/14/2012 - The app is now universal and it has custom interfaces for iPhone and iPad - On the iPad the app can be used in portrait or landscape orientation - Please give feedback and get information about 18 other math apps by visiting http://idevbooks.com 2.0 02/09/2012 Bug fix: Sometimes the numbers became dim after setting a new problem. 1.4 12/08/2011 - You can now solve custom and random problems - Support for fast app switching in iOS 4 - New icon - Some minor interface changes 1.3 01/18/2011 - Minor bug fixes - The app has been translated also into French If you have any questions, requests for new features or would like to see my 17 other math apps please visit http://idevbooks.com 1.2 06/09/2010 No serious bugs have been found or reported. Some minor issues with settings panel and animations have changed: -The preview of the settings did not work correctly when the number of digits was changed. -The next operands are now highlighted only when the animations have ended Thank you for using this app. Please also see my other apps for division, multiplication, addition and subtraction. Please contact me if you have any questions or suggestions. 1.1 02/05/2010 1.0 01/26/2010

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Previous Versions

Here you can find the changelog of Trade-First Subtraction since it was posted on our website on 2016-10-14 00:21:44. The latest version is 7.0 and it was updated on 2026-10-18 17:01:03. See below the changes in each version.

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