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Joseph O'Rourke
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This California college has a no-frills $602$-page textbook available for free PDF download:

College of the Redwoods Mathematics Prealgebra Textbook. 2012-13. (PublisherLink).

There was a free website for download in 2015, but apparently no more. Before its demise, I browsed through book.

What "fluff" the textbook authors include is hardly fluff; rather, educational:


          Horus


Note the sum $$ \frac{1}{2} + \frac{1}{4} + \frac{1}{8} + \frac{1}{16} + \frac{1}{32} + \frac{1}{64} = \frac{63}{64} $$ is missing $\frac{1}{64}$ of Horus's eye.
Joseph O'Rourke
  • 30.2k
  • 6
  • 64
  • 146