Matrices help solve systems of equations in chemistry, computer graphics, circuitry, probability, and more. The second instructional activity in a seven-part series focuses on using matrices to balance chemical equations. Pupils rely on...

Students explain why a transiting planet causes a periodic dimming in the light from its parent star. They determine the radius of a planet, and its orbital distance, by analyzing data and manipulating equations. Students compare the...

Students examine collections. In these real-world collections lessons, students examine and describe buttons and shells. Students will then sort, classify, and graph items according to various indicated descriptors.

Students compare and contrast the various types of rocks on each continent. In groups, the calculate the rock ages and types to determine if the continents, in their opinion, were joined at one time. They develop two imaginary...