Download of MathBoardAddition 3.5 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The following version: 2.0 is the most frequently downloaded one by the program users. This free Mac app is an intellectual property of palasoftware Inc. The program lies within Education Tools, more precisely Teaching Tools.
From the developer:
MathBoard Addition is the FREE "Addition Only" version of MathBoard.
MathBoard Addition is a highly configurable math app appropriate for all school aged children learning addition. MathBoard Addition will allow you to configure the app to best match the abilities of your individual child/student.
More than just standard drills, MathBoard encourages students to actually solve problems, and not just guess at answers.
You may want to check out more Mac applications, such as Dolce Music Flash Cards, Learn To Draw or dvcUniversity, which might be related to MathBoardAddition.