This link is about some of the definitions in Geometry. It will state the definition but also give visuals related to the geometry terms being defined.
I would use this interactive activity as a follow up to learning some of the foundations of geometry: Points and Lines. I like how students are able to manipulate the drawings in each set of instructions. I also like how there is an exploration section that will show step by step how to create the geometric constructions that relate to the given terms. As students read through the instructions they will click an icon that will show the graphical representation of that step.
This link is a lesson on the use of exponential growth(decay) and percent change as it relates to our National Debt and Wars.
Because this lesson involves the National Debt and how certain Wars (Civil War, WW1 and WW2) have effected it, I would want to collaborate with the Social Studies teachers when they teach about any of these particular wars. It would be a good cross-curricular lesson to show students how math is involved in history class and history involved in math class. Hopefully students would make the connection that math isn't just for math class and they aren't just learning formulas for the "fun" of it.
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