ALEX Lesson Plans Thinkfinity Lesson Plans Subject: MathematicsTitle: Approximations of Pi      Add Bookmark Description: This student reproducible, from an Illuminations lesson, provides information about and several examples of approximations for the constant pi.Thinkfinity Partner: IlluminationsGrade Span: 6,7,8Subject: MathematicsTitle: Limits       Add Bookmark Description: This student interactive, from an Illuminations lesson, allows students to see a representation of three geometric series and the harmonic series.Thinkfinity Partner: IlluminationsGrade Span: 9,10,11,12Subject: Mathematics,ScienceTitle: Whelk-Come to Mathematics      Add Bookmark Description: In this four-lesson unit, from Illuminations, students make a conjecture, conduct an experiment, analyze data and work to a conclusion using rational functions to investigate the behavior of Northwestern Crows. Sea gulls and crows feed on various types of mollusks by lifting them into the air and dropping them onto a rock to break open their shells. Biologists have observed that northwestern crows consistently drop a type of mollusk called a whelk from a mean height of about 5 meters. Students investigate the relationship between the height of the drop and the number of drops.Thinkfinity Partner: IlluminationsGrade Span: 9,10,11,12Subject: Mathematics,ScienceTitle: Conduct an Experiment      Add Bookmark Description: In this lesson, one of a multi-part unit from Illuminations, students use rational functions to investigate the feeding behavior of Northwestern Crows. Biologists have observed that northwestern crows consistently drop a type of mollusk called a whelk from a mean height of about 5 meters. Students investigate whether the crows minimize their work by dropping whelks as they do. The amount of work depends upon the height of the drop and the number of times the crow has to fly to this height. To answer the question, students explore the relationship between the height of the drop and the number of drops needed.Thinkfinity Partner: IlluminationsGrade Span: 9,10,11,12