sub3 6.0



Publisher Description



Most 2nd and 3rd graders struggle with subtraction problems that require borrowing. Having to strike-through numbers and then stack new numbers above them is a confusing process that leads to frustration and under achievement. Here is the answer: let the student step through a prompted sequence and be checked as he/she goes. Let the student concentrate on the essential arithmetic without having to worry about doing neat strike-through's and lining up columns of new numbers. Your child/student will appreciate the neat tableau that is generated as he/she follows the prompts and answers the questions. The prompts consist of either a yes/no question regarding whether a particular column needs to borrow or question marks where the new numbers should be in the normal borrowing tableau (“?” if a single digit answer is expected, and “??” if a 2 digit answer is expected). The question marks are automatically replaced by numbers entered from the virtual numeric keypad occupying the lower part of the screen. If the student accidentally presses the wrong numeric key, it can be erased by the “del” key and re-entered. All numeric entries are committed by tapping the “done” virtual key. If the student commits an incorrect answer, the error count is incremented, and he/she is instructed to try again. The student cannot proceed to the next step until the correct answer (numeric value or yes/no).

When the problem is complete both the student and the teacher/parent can see if any errors were made (and corrected) along the way before arriving at the final answer. Doing a sequence of exercises without errors will demonstrate that the skill has been mastered.

Most arithmetic programs follow the “electronic flashcard” paradigm: just present the problems for the student to work and score the response when the student is finished. This leaves the student to struggle through the solution with pencil and paper. If the student finally enters an incorrect answer, and the computer tells him so, the student has no idea what went wrong. In contrast sub3 provides prompts that present the student with a sequence of challenges and immediate feedback after each step. A tedious exercise is turned into a fascinating game. Another advantage of sub3 is that the numbers for each problem are generated randomly so the student will never see the same problem twice.

The extensive instructions included with this app provide comprehensive descriptions of all the steps involved in subtraction with borrowing, which will be a great help for the parent who needs to supplement what the student has learned in the classroom. This initial, free, version of the program uses only 3 digit numbers (hence the name sub3), which should provide sufficient problem variety to ensure the development of excellent student skills. If several thousand people install the free app, I will provide an extended version to allow the user to choose a larger number of digits, and charge a few dollars.



About sub3

sub3 is a free app for Android published in the Teaching & Training Tools list of apps, part of Education.

The company that develops sub3 is Peter Gottlieb. The latest version released by its developer is 6.0. This app was rated by 1 users of our site and has an average rating of 4.0.

To install sub3 on your Android device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2012-06-18 and was downloaded 12 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the sub3 as malware as malware if the download link to sub3.test is broken.

How to install sub3 on your Android device:

  • Click on the Continue To App button on our website. This will redirect you to Google Play.
  • Once the sub3 is shown in the Google Play listing of your Android device, you can start its download and installation. Tap on the Install button located below the search bar and to the right of the app icon.
  • A pop-up window with the permissions required by sub3 will be shown. Click on Accept to continue the process.
  • sub3 will be downloaded onto your device, displaying a progress. Once the download completes, the installation will start and you'll get a notification after the installation is finished.



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Users Rating:  
  4.0/5     1
Downloads: 12
Updated At: 2024-03-06
Publisher: Peter Gottlieb
Operating System: Android
License Type: Free