About Cotter AL Abacus
Cotter AL Abacus, used with the RightStart(TM) Mathematics program, now available on your iPhone and iPad! This abacus will teach, not calculate like the Japanese and Chinese abacus, while using subitizing (quantity...
Cotter AL Abacus, used with the RightStart(TM) Mathematics program, now available on your iPhone and iPad! This abacus will teach, not calculate like the Japanese and Chinese abacus, while using subitizing (quantity recognition) and visual strategies to support learning and understanding. Perfect for visual learners! This unique double-sided abacus is grouped in fives and tens for quick recognition of quantities. The second side of the abacus focuses on trading to the thousands. Learn the facts easily by: * visualizing quantities, * minimizing counting, and * developing mental strategies. Those learning arithmetic with the Cotter AL Abacus have a better understanding of basic concepts and need less time to master arithmetic. Although children do enjoy using the abacus, it does not become a crutch. Stan, age 5, was asked how much is 11 plus 6. He replied, “17!” When he was asked how he knew, he replied with a grin, “I’ve got the abacus in my mind.” App has links to sample addition, subtraction, multiplication, and division lessons as well as detailed use information.
Version History Upgrade and performance improvements. 1.93 12/22/2025 Added new screenshots. 1.92 08/25/2025 Updated graphics on the Apple Store. 1.91 06/14/2025 Upgrade and performance improvements 1.9 05/16/2024 Upgrade and performance improvements 1.8 07/13/2020 Added Share with a friend Functionality. 1.7 04/18/2018 Update the app icon. 1.6 01/10/2018 improvements & adaptions to the latest iOS versions. 1.5 12/20/2017 Fixed links 1.4 08/06/2014 Corrected the aspect ratio for iPhones 5 and 5s. 1.3 05/15/2014 Fixes all issues for devices on iOS7 1.2 01/30/2014 Added iPhone capability, updated URLs, and change sensitivity for bead clearing on the trading side. 1.1 05/24/2012 1.0 12/07/2010
Previous Versions
Here you can find the changelog of Cotter AL Abacus since it was posted on our website on 2016-10-02 12:09:42.
The latest version is 1.93 and it was updated on 2026-06-27 23:29:32. See below the changes in each version.
Cotter AL Abacus version 1.93
Updated At: 2026-06-09
Changes: Version History Upgrade and performance improvements. 1.93 12/22/2025 Added new screenshots. 1.92 08/25/2025 Updated graphics on the Apple Store. 1.91 06/14/2025 Upgrade and performance improvements 1.9 05/16/2024 Upgrade and performance improvements 1.8 07/13/2020 Added Share with a friend Functionality. 1.7 04/18/2018 Update the app icon. 1.6 01/10/2018 improvements & adaptions to the latest iOS versions. 1.5 12/20/2017 Fixed links 1.4 08/06/2014 Corrected the aspect ratio for iPhones 5 and 5s. 1.3 05/15/2014 Fixes all issues for devices on iOS7 1.2 01/30/2014 Added iPhone capability, updated URLs, and change sensitivity for bead clearing on the trading side. 1.1 05/24/2012 1.0 12/07/2010
Cotter AL Abacus version 1.93
Updated At: 2025-12-22
Changes: Upgrade and performance improvements.
Cotter AL Abacus version 1.92
Updated At: 2025-08-25
Changes: Aug 25, 2025
Version 1.92
Added new screenshots.
Cotter AL Abacus version 1.91
Updated At: 2025-06-14
Changes: Jun 14, 2025
Version 1.91
Updated graphics on the Apple Store.
Cotter AL Abacus version 1.9
Updated At: 2024-05-16
Changes: May 16, 2024
Version 1.9
Upgrade and performance improvements
Cotter AL Abacus version 1.8
Updated At: 2020-07-13
Changes: Jul 13, 2020 Version 1.8
Upgrade and performance improvements
Cotter AL Abacus version 1.8
Updated At: 2020-07-13
Changes: 13 Jul 2020 Version 1.8
Upgrade and performance improvements
Cotter AL Abacus version 1.7
Updated At: 2018-04-18
Changes: Apr 18, 2018 Version 1.7
Added Share with a friend Functionality.
Cotter AL Abacus version 1.4
Updated At: 2010-12-15
Cotter AL Abacus version 1.8
Updated At: 1970-01-01
Changes: 2020年7月13日 Version 1.8
Upgrade and performance improvements
Disclaimer
Official App Store Link
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