• Mathematical Cat Swinging in a Tree

    Welcome to Tree of Math
          at OneMathematicalCat.org

  • a typical lesson

    about 400 high-quality math lessons

  • the online practice form

    randomly-generated online practice in every lesson

  • a typical worksheet

    unlimited printable worksheets with solutions

  • education and honors for Carol

    highly-credentialed author

Welcome! We're so glad you're here. Looking for high school and early college math? Want to truly understand what you're doing? You've come to the right place.

Start with arithmetic. Proceed step-by-guided-step through Algebra, Geometry, Precalculus, more. Or, jump to just what you need. Quick explanations or full text—your choice.

You'll never run out of practice. There are unlimited exercises and worksheets for every lesson—all randomly-generated, all with solutions. Practice online or offline. Time yourself.

All free. Highly-credentialed author. Algebra Pinball. State-of-the-art mathematics display. Have fun looking around!

Dr. Carol JVF Burns


Carol (that's me) writes the lessons and creates the exercises. This web site has given meaning to my life since 1999—over 20,000 hours.

I have a Doctor of Arts in Mathematics (a doctoral-level degree that emphasizes effective teaching), and have taught for about 30 years at both the college and high school levels.

about 400 Lessons



Get to know me! I think it's more fun to learn from someone you know. How old am I?   Do I have any kids?   What's my favorite number?   Do I play ping-pong?


You can time yourself on a lot of my exercises. I remember watching my students at Miss Hall's School trying to beat a really fast time—their fingers were flying! It made me think of someone using a pinball machine, and thus was born ‘Algebra Pinball’.


This is the book that started my entire web site. Brooks-Cole publishers loved it. They said: “If you can find the right place to put it, this book will do a great service to the mathematical educational world.” Here are all my books.



Take up residence in my own one-dimensional world.

I am a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for me to earn fees by linking to Amazon.com and affiliated sites.

Say hello before you leave

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The email above is a mix of graphics and text to try and foil spammers.
If it helps, you can cut-and-paste this piece of the email address: OneMathematicalCat

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