Connections: A Cage to Save a Whale

Everyday Math (2004)
Teacher Lesson Guide: pp. 164-169, 184-185, 742-745
Student Reference Book: pp. 166, 169

TERC (2006)
From Paces to Feet
Investigation 1, Sessions 1-4: pp. 2-19
Investigation 2, Session 1: pp. 28-36