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 OBJECTIVE - G.MG.A.2   Apply concepts of density based on area and volume in modeling situations (e.g., persons per square mile, BTUs per cubic foot).   INTERPRETATION OF OBJECTIVE - G.MG.A.2 This objective connects the concept of density to geometric measurement, this applies to both area and volume.  Population density is a specific example of this relationship. VIDEO IN DEVELOPMENT SKILLS (1) The student will be able to calculate density (D), mass (m) or volume (V) using the formula, D = m/V. (2) The student will be able to use area relationships and formulas to solve population density problems. THE BIG IDEA The purpose of this is to connect shape, form, and size that students are familiar with in the geometry class to the world around them.  They are to use their geometric knowledge to gain real world knowledge. TRAPS & PITFALLS The examples provide in the objective certainly help us to focus on certain aspects of density but like with all modelling standards it is hard to know where to best put our time and effort.  Density and its connection to volume and population density and its connect to area are exactly what this standard is really getting at so time spent here will be of great benefit. PAST CONNECTIONS Students come to geometry with some basic knowledge of perimeter and area.  While in geometry they will learn more about volume.  These concepts will be critical for obtaining information about density.   FUTURE CONNECTIONS Estimating size, shape and form is important in dealing with real world problems that don’t come in easily packaged problems.  The skills learned here will give students a chance to attack harder problems. MY REFLECTIONS (over line l) This is so difficult to get right.  I have taken a more general approach to problem solving in hopes that students will be more involved in concept connecting and troubleshooting.  I want them to use collective knowledge to accomplish a more challenging goal.  I want them to see problems from different perspectives so that they can have strategies to handle problems that don’t come with obvious steps.