Look at pictures of Maya art.
Look for representations of corn and other plants.
Createa clay figure or a drawing that represents foods most important in your own culture.
How much do you know about the ethnic groups that live in your community?
Visit a largegrocery store and list as many products as possible that come from other countries.
Visit local ethnic markets and note which plant foods seem to be most prevalent.
Talk to the store owner about how the foods are prepared.
You may need to ask someone in the store to translate the labels for you.
The ancient Maya numeration system used base 20, unlike the Hindu-Arabic system which uses base 10.
Research the Maya numeration system, as well as other systems, and compare them with the system you use.
Two good references are Multicultural Math Posters from Kay Curriculum Press [(800) 338-7638] and Multicultural Mathematics Posters and Activities from the National Council of Teachers of Mathematics [(800) 235-7566].