shaggy-red-wsijgbj5-dpcs5zngtzop.edgeone.dev presents itself as a math practice bank, likely run by an individual educator or student. The site focuses on rational number operations, and the content appears to be genuine educational material. For a personal project of this nature, the absence of an about page, privacy policy, or contact form is not unusual — most small educational blogs operate the same way.
What's worth noting is that the domain is very new and left no traces in the Wayback Machine, so it doesn't have a long track record. The security setup is decent for a static site: HTTPS is enabled with a valid certificate. However, the site still accepts older TLS versions, which is a small technical risk but unlikely to affect a casual visitor browsing math problems.
If you're considering using this site for studying, there's no strong reason to avoid it. The biggest limitation is that you can't reach the creator if you run into issues. That's common for free educational resources, but if you'd rather use established platforms like Khan Academy or local government resources, that's understandable. Overall, this site appears to be a harmless personal project, not a scam.