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Lesson Plan
Curated OER

Calculating Elapsed Time

For Teachers 2nd - 5th
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...
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Unit Plan
PBS

Pbs: Base 60: Babylonian Decimals

For Students 3rd - 5th Standards
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...