Math is a right,
not a privilege.
Numberbender exists to make rigorous, bilingual math education free and accessible to every student — regardless of income, language, or zip code.
Free math — at scale
Every number below represents a student or educator who got something for free that would otherwise cost them.
Three problems we're solving
Language is a barrier to math
Most online math is English-only. Millions of students in the Philippines, the Filipino diaspora, and bilingual classrooms have never had rigorous math explained in their home language. Every Numberbender lesson exists in both English and Filipino.
Cost locks students out
Tutoring is $50–$120 an hour. Test prep courses cost hundreds. Students at under-resourced schools get less. Numberbender gives every student — regardless of what their family earns — access to the same quality instruction.
Educators need better tools
Most teachers learn to teach online through trial and error. Numberbender's free resources — worksheets, flipped classroom guides, video production training — exist because educators deserve the same support their students do.
Free forever — by design
The "free" isn't a marketing tactic. It's structural. All Numberbender content is openly licensed under Creative Commons (CC BY 4.0) — meaning educators and institutions can use, adapt, and share it without asking for permission.
No login. No paywall.
Every video, every worksheet, every answer key — available instantly, no account required. We don't capture your data to unlock content.
CC BY 4.0 licensed
All original content can be shared, remixed, and used in other educational materials as long as credit is given to Peter Esperanza / Numberbender. That's it.
C-ID aligned for California
Course materials map to the statewide C-ID standard used by all 116 California community colleges — making it easy for instructors to drop them into any LMS as OER supplements.
Nonprofit status
Three ways to help
The best thing you can do is use the free resources. The second best thing is share them. Everything else is icing.
Use the free materials
Every student who watches a video or downloads a worksheet is exactly who this nonprofit exists for. No donation needed — just learn.
Explore free lessons →Share with a student or teacher
Know a student struggling with calculus or a teacher building their first flipped lesson? Send them this link. Word of mouth is our entire marketing budget.
For educators →Partner or donate
Schools, districts, and foundations can partner with Numberbender to expand access. Individual donations support server costs, content production, and new worksheet development.
Get in touch →The mission is simple.
Every student deserves a great math teacher. Numberbender is trying to be that teacher — for free, forever, in both English and Filipino.