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Number and operations  
Educational Level:
Informal education  
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This is the first module in the Solar Dynamic Observatory (SDO) Project Suite curriculum. Activities are self-directed by students or student teams using online videos and data from the SDO satellite to explore, research and build knowledge about... (View More)

Keywords: Sunspots
Audience: Middle school, Informal education
Materials Cost: $1 - $5

This simple exercise demonstrates how Maya numbers are written and how higher place values of numbers are calculated. This activity can also be used in informal education settings with people ages 9 through adult. Includes information for educators,... (View More)

In this activity, students construct adding slide rules, scaled with linear calibrations like ordinary rulers. Students learn to move these scales relative to each other in ways that add and subtract distances, thus calculating sums and differences.... (View More)