How did I not know about this? I’m always looking for cross-curricular resources to teach mathematics and I just found this terrific list at the Primary Sources Nexus https://primarysourcenexus.org/2012/02/primary-sources-math-does-this-add-up/
My favorite one so far is this lesson using the codex
https://www.loc.gov/classroom-materials/huexotzinco-codex/
I actually knew about this resource , but the lesson using it is so cool.
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For more ideas on teaching with the Huexotzinco Codex, see this superb pair of webinars presented by former Library of Congress Teacher in Residence 
Sherrie Galloway
for the TPS Western Region series put together for teachers going online at the beginning of the Covid pandemic. You can watch them here in the Network or on YouTube, as you'll see, and each one is under 30 minutes.
Turkeys, chili peppers and corn: Analyzing an Historic Codex (Part 1)
Turkeys, chili peppers and corn: Analyzing an Historic Codex (Part 2)
So many possibilities for math!
3 - 5 6 - 8 9 - 12 Mathematics Social Studies/History Codex Mesoamerica
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