License
Numberbender’s original lessons and worksheets are openly licensed, so teachers and students anywhere can use, adapt, and translate them — for free, forever.
Creative Commons Attribution 4.0 International (CC BY 4.0). You are free to share and adapt Numberbender’s original content — even commercially — as long as you give appropriate credit. No login, no paywall, no permission request needed.
Licensed under CC BY 4.0.
What you can do
- Share — copy and redistribute the lessons and worksheets in any medium or format.
- Adapt — remix, transform, translate, and build upon them, including for commercial purposes.
- Use in class — print, project, post to your LMS, or hand out to students freely.
The only condition is attribution (below). These freedoms cannot be revoked as long as you follow the license terms.
How to credit Numberbender
Please use this attribution wherever you reuse or adapt the material:
“Numberbender” by Peter Esperanza (Dr. E) — numberbender.com — licensed under CC BY 4.0. If you adapt or translate the material, please note that changes were made.
Bilingual & open by design
Numberbender’s lessons are taught in both English and Filipino (Tagalog). The open license exists to help teachers localize and translate math instruction for their own classrooms and communities.
Recognized & listed by
Numberbender is an independently verified open educational resource:
- BCcampus OER by Discipline Directory (Canada) — listed in the Mathematics chapter.
- LibreTexts — verified instructor across Mathematics, Statistics, and more (libretexts.org).
Questions about reuse
Building something with Numberbender content? We’d love to hear about it — reach us via the contact page.