Curated OER
Science in History Part I: the Abacus To the Modern Computer
In this math information instructional activity, students read one page factual accounts of the early math inventions of the abacus, the calculator and early computers. There are 40 questions to answer about the reading.
Curated OER
Area of Tangram Pieces
Mathematicians calculate the area of a tangram piece without using formulas. They use a geometry journal to record activities during this lesson. They make a set of tangrams and use them to compute area. They use what they discover to...
Curated OER
Cut - Stretch - Fold
Students work on determining the area of a tangram piece without using a formula by working with geoboards, graph paper, and tangram pieces. After completing the activity, they apply their experience to determining a formula for finding...