Can't remember the name but my neighbor showed me.
It isn't as bad as some of the ones that you all have been listing. It does teach standard algorithms, however, the topics are not sequential and there is not nearly enough practice.
While I wouldn't instantly gouge my eyes out if my child came home with this textbook I probably do so within a day or two since in this textbook's alternate universe plumbers do number theory on their jobs (aka perform operations on fractions) and mathematicians have been using decimal expansions for centuries in an attempt to understand PI.
Never is an opportunity passed up in which math is not treated like an experimental subject and fallacious reasoning is encouraged whenever possible. Want to know more about PI? Grab a measuring tape and a calculator.
The kids are frequently denied recess all day long and I've been told that the playground is as much fun as the math classes.