Curated OER
Calculating Elapsed Time
Students calculate elapsed time in a series of activities. In this calculating time lesson, students view a Cyberchase video that demonstrates how to calculate elapsed time. Activities include counting, subtracting and regrouping in base...
PBS
Pbs: Base 60: Babylonian Decimals
Explore a brief history of mathematics in Mesopotamia through the Babylonian Base 60 number system. This video focuses on how a base 60 system does not use fractions or repeating decimals, some of the advantages of a base 60 system, and...