Another resource I wanted to mention here is OpenStax. Specifically, their Prealgebra book: https://openstax.org/details/books/prealgebra-2e https://openstax.or

Another resource I wanted to mention here is OpenStax. Specifically, their Prealgebra book: https://openstax.org/details/books/prealgebra-2e https://openstax.org/details/books/prealgebra-2e it's a fully online-native book format with exercises, etc.