Teach Online with
More Energy.
More Impact.
Free flipped classroom resources, online teaching strategies, and professional development for teachers who want to show up differently in the digital classroom — from a math professor who has been doing it since 2012.
Four ways Numberbender supports educators
Whether you're just starting with online teaching or ready to build a full content creator practice — there's a path here for you.
Teach It Like You Stream It
Dr. E's flagship educator training — a creator-style approach to online teaching that helps you show up on camera with energy, clarity, and presence. Learn video production basics, engagement strategies, and how to build a following as an educator.
Explore TILYSI →Flipped Classroom for Teachers
A research-backed, step-by-step guide to flipping your classroom — whether you teach in-person, online, or hybrid. Based on Dr. E's peer-reviewed published research and 10+ years of classroom implementation across K-12 and higher education.
Read the guide →Free Teacher Resources
Templates, checklists, AI prompts, video setup guides, rubrics, and lesson frameworks — everything Dr. E uses in his own online classroom, packaged up and free to download. No email required for most.
Get free resources →Workshops & Keynotes
Bring Dr. E to your school, college, or conference. He delivers hands-on workshops, faculty development sessions, and keynotes on flipped learning, AI in education, and online teaching — in formats from 2 hours to a full semester of PD.
Book Dr. E →
He didn't just study online teaching. He built it from scratch.
In 2012, Dr. Peter Esperanza started recording math videos for his high school algebra students after school. He had no studio, no following, and no roadmap. He just knew his students needed something better than the textbook.
Over the next decade he recorded 800+ YouTube lessons, earned a Silver Play Button, presented his research at conferences in Europe and Asia, trained hundreds of educators, and built a nonprofit to make sure everything stayed free.
When he teaches educators how to teach online, he's not sharing theory. He's sharing the exact system he built and tested in his own classroom for over 20 years.
Resources you can use this week
No paywalls. No upsells. Just practical tools from a teacher who's been in the room.
Flipped Classroom Quickstart Guide
A condensed, practical PDF walking you through the first steps of flipping your classroom — even if you've never recorded a video before.
Download free →Video Lesson Checklist
30 things to check before you hit record — from lighting and audio to pacing and student prompts. Works for Loom, Zoom, or a full studio setup.
Get the checklist →AI Prompts for Lesson Planning
Dr. E's tested ChatGPT and AI prompts for creating lesson outlines, writing discussion questions, and building formative assessments faster.
Get the prompts →Flipped Classroom Research
Peer-reviewed evidence that the flipped model works — Dr. E's published studies on student performance, attitudes, and engagement in flipped math classes.
Read the research →Flipped Classroom Books
A curated reading list of the best books on flipped learning, online teaching, and educational content creation — with Dr. E's own recommendations.
See the list →Weekly Teaching Tips
One practical tip per week — from flipped classroom strategies to video production, AI tools, and online engagement. Free in your inbox.
Join the newsletter →Teach the Math — watch Dr. E teach it first.
Not lessons for your students — lessons for you. Watch how Dr. E actually teaches each topic in a real classroom: the pacing, the board work, the questions, the moves that land. The clearest way to flip a unit is to see a master teacher do it first — in English and Filipino.
How teachers use it
The Flipped Classroom Library
Everything Dr. E has published on flipping a math classroom — research, real-world guides, and the mistakes to skip — in one place.
Flipped Classroom Math
What actually works after 15 years, one peer-reviewed RCT, and 340K+ subscribers.
Start here →Flipped Classroom Videos
The full library of free flipped video lessons — Algebra through AP Calculus.
Browse videos →The Research
Peer-reviewed evidence: 2014 AACE, 2016 RCT, 2021 IJMEST, and an ongoing 2025–26 study.
Read the research →Distance Learning
What survived COVID, what evolved, and what online-first flipping looks like now.
See how →Higher Education
What transfers from K–12, what doesn't, and findings from a community-college study.
For college faculty →5 Mistakes to Avoid
The real mistakes Dr. E made in his first two years flipping — and how to skip them.
Avoid these →AP Statistics Guide
Which units to flip first, how to handle FRQs, and what the data says.
For stats teachers →Free Apple Book
“The Power of the Flipped Classroom” — a free multi-touch book on Apple Books.
Get the book →What teachers say about Dr. E's approach
I was hesitant to record my first video — it always felt awkward and I cringed watching myself back. Dr. E told me to focus on the students in my classroom and ignore the noise of who else might watch, and that one shift unlocked it. I found a skill I never thought I could do.
Dr. E's flipped classroom model completely changed how I approach math instruction. My students come to class having already watched the concept — and now our class time is spent actually doing math together, not just watching me lecture. The difference in engagement is night and day.