About OpenMathBook

A free, trilingual platform for learning mathematics — explanations, practice, and exams, every question worked through to the end.

Who's behind OpenMathBook?

Hi, I'm Ravit Helfenbaum — founder of OpenMathBook, math teacher, online-course developer, and distance-learning specialist.

For more than 20 years I've been teaching mathematics, statistics, and economics, supporting learners of every age — from middle-schoolers to university students, including learners with diagnosed learning differences — toward real, lasting success.

I hold a B.Sc. in engineering (with honors), a master's degree in education, and a teaching certificate for secondary-school mathematics, with certification for the advanced curriculum.

Over the years I've contributed to national education initiatives, developed online courses, and led volunteer distance-learning projects during emergency periods — driven by a deep commitment to high-quality, accessible education.

"Teaching is my calling. I don't just teach — I see each student. I understand what's holding them back, and I find the way to switch the light on for them.

I believe in learning that feels right: precise, accessible, and genuinely inspiring. I'm not only a teacher — I'm also a developer, editor, programmer, and videographer, because I want every learner to experience teaching that connects deep expertise with real human warmth."

What you'll find on OpenMathBook

  • Learn — step-by-step explanations, worked examples, and visual aids that turn abstract concepts into something you can actually picture.
  • Practice — thousands of fresh problems, each with a complete solution and instant feedback.
  • Exams — full topic-level exams for self-assessment and real exam readiness.
  • Pages — articles and guides that connect topics and explain why the math works the way it does.

Why OpenMathBook?

  • Free and open — no signup, no paywall, no hidden subscription.
  • Three languages — English, Hebrew, and Arabic, so every learner can study in the language they think in.
  • Original content — every lesson written, edited, recorded, and reviewed by one teacher with 20+ years of real classroom experience.
  • A calm reading experience — clean design with minimal distractions, so you can actually focus on the material.

Math doesn't have to be frustrating. Anyone can understand it — when someone takes the time to see them, and explain it the right way. That's what I'm here for.

— Ravit

Got a question, a suggestion, or an idea for a lesson you'd like to see here? Get in touch — we'd love to hear from you.