Privacy

This implementation calculates in your browser. It does not send your calculator inputs or private challenge attempts to a signup, analytics or payment service.

Shared links and downloaded files

When you choose Copy challenge link, the URL fragment contains the current public title, divisor, dividends and instruction setting. Anyone you send that link to can read those questions. Your attempted quotients, attempted remainders and worked answers are omitted.

The questions PDF, CSV, JSON and image contain the current questions. The separate answer-key PDF contains solutions. Keep that key separate when sharing a practice worksheet.

Signup and checkout

Guide signup, email delivery, checkout, paid-file delivery and tips are not connected. Disabled forms do not submit personal information. Hosting providers can maintain routine server logs under their own policies.

Your browser

The page does not store your worksheet in a database. Save a questions file or use a shared link if you want to return later. Downloaded files remain wherever your browser saves them.