Closeup of Abraham Lincoln on Mount Rushmore with fractures running across.
Ninth Grade-Twelfth Grade
Five to seven 50-minute sessions
Geometry, Algebra, Measurement and Data for 9th through 12th grades Common Core Curriculum Standards (http://www.corestandards.org/the-standards/mathematics) G-CO.12, G-SRT.1, G-GPE.7, G-GMD.1, G-GMD.4, G-MG.2
Students calculate an estimate the weight of Mount Rushmore by calculating the volume using cross sections of the model, then use density of stone to finally arrive at a rough estimate of the weight. Finally, students calculate when two cracks on the surface of the sculpture would intersect over time.