I highly doubt it. They are problem books and aren’t aimed at middle school kids. My guess would be the [1] Science for everyone pocket books. They fit the description but definitely have more than 20-30 pages.

[1] https://mirtitles.org/tag/science-for-everyone/

Thanks!!!!

I didn't remember the name of the series and this is it. Found my favorite logarithm book:

https://mirtitles.org/2012/09/05/little-mathematics-library-...

And my memory was hazy. These are 70-80 pages rather than 20-30. They seemed like short books when I was reading them :-)

Ah yes the little mathematics library :) I had a book or two from this series but never really got into them. Was more into Perelman's books on puzzles and riddles at that age. And speaking of pocket science books, my favorite is [1] 'Straight Lines and Curves'. Accessible to high schoolers with quirky illustrations and introduces many interesting concepts.

[1] https://mirtitles.org/2013/10/21/straight-lines-and-curves-v...

Do you have links to the math books?

Thanks a lot!