Mortensen Math
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Mortensen Math was developed by Jerry Mortensen (V.J. Mortensen) while working as a Montessori teacher.
Sources
Mortensen Math Direct
As far as I can tell, this is the official Mortensen Math website, but it is such an awful site that it is almost impossible to find anything on it. It looks like it was designed in the mid-nineties as hasn't been updated since.
Crewton Ramone's House of Math
This is the website of Ben Rogers who worked as a teacher trainer under Jerry Mortensen. There are several videos available for free, and many additional videos are available with a password ($5/1 month, $10/3 months, $15/6 months, $24/1 year).
Math-U-See
Math-U-See was developed by Steve Demme after being trained in the Mortensen Math method. This is probably the most widely available version of Mortensen Math, but the lessons are more structured and formal. They also more closely follow the order of skills as they would be taught in traditional schools. It is used primarily as a homeschool math curriculum.
