I’ve used the Zambak series extensively. The Pre-Algebra 1 PDF is hard to find because Zambak Publishing is based in Turkey (now part of larger educational groups), and they aggressively protect their newer editions.
"Pros: You can search the text for keywords like 'Distributive Property.' You can print just the odd-numbered pages for homework. Cons: Some older scans of the 2008 edition have missing page corners. Make sure you get the color PDF, because the diagrams use red and blue for integer operations—very important."
Their Pre Algebra 1 book is specifically designed for middle school students (Grades 6-8) who have mastered fractions, decimals, and basic operations but are not yet ready for variables and functions. Zambak Pre Algebra 1 Pdf
Use the Zambak Pre-Algebra 1 PDF alongside official solution guides to check your logic, not just your final answer.
Introduction to the concept of sets, operations on sets, and different numeration systems. I’ve used the Zambak series extensively
Disclaimer: Always respect copyright. Zambak books are still in print in many regions.
If you just need the content , look for "Glencoe Pre-Algebra" or "AoPS Pre-Algebra" – they follow a similar scope and sequence, though the visual style differs. Cons: Some older scans of the 2008 edition
(Flip through the pages of the PDF on screen) "Look at this layout. Unlike American textbooks that have 50 pictures of kids on skateboards, Zambak gets straight to the point. Page one—Integers on a number line. But watch this: by page 30, they are already mixing fractions with negative exponents. It’s rigorous but logical."