Ratios Websites
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AAAKnow
AAAKnow.com presents a comprehensive set of interactive math lessons for grades K-8
1,161,423 
$ 1,200.00
Factorio Cheat Sheet
A compendium of the most common Factorio game facts, such as build ratios, tips/tricks, and links to further information.
616,077 $ 2,160.00
AAA Math
AAA Math features a comprehensive set of interactive arithmetic lessons. Unlimited practice is available on each topic which allows thorough mastery of the concepts.
8,043,068 $ 240.00