Self-Tests

All tools

Level: All levels · Prerequisite: none; this page checks the tools, it does not teach them.

Running checks…

Each check below recomputes a known value from the tool’s own formula and compares it with the expected answer. A failed check means the tool, not the test, needs fixing: expected values here are never adjusted to match a wrong result.

Calculation checks run in this page on their own, with no network access. Page, data and search checks fetch the site’s own files, so they run only when the site is served over HTTP; opened as a file, they are listed as not run.