For librarians, faculty and student organizations. One line of HTML adds a self-grading pharmacy calculation problem, with a worked solution, to any page you control.
It works in LibGuides, Canvas, Blackboard, WordPress and anything else that accepts an iframe. Every visitor sees the same problem for the day, so a class can work one question together, and the "New problem" button draws a fresh one on demand. Free, no account, and nothing is collected from your students.
1. Pick what it shows
2. Copy the code
The last line is optional. It lets the frame grow to fit a long worked solution instead of scrolling inside itself. If your platform strips script tags (Canvas does), leave it out; the frame still works at a fixed height.
3. This is what your students will see
Questions people ask
Is it really free? Yes. The site is free and stays free. There is a premium waitlist for extra features later; nothing in the embed depends on it.
What does it collect? Nothing from the person doing the problem. No account, no cookies, no email. Cloudflare counts page views for the site as a whole.
Who writes the problems? I do. I am a PharmD, and every problem type was written and checked by me. Details on the About page. If you find an error, email me and I will fix it.
Can I link instead of embed? Of course. rxmathlab.com for everything, or any topic page directly. The printable formula sheet is also free to distribute.