Day 161: Practice

Algebra and Geometry both had work days today.

Geometry is in a weird place… Half my students know all the formulas for volumes already and the other half appear to have never have seen them before. Also, I don’t know any of the tricks to help students remember the formulas. We watched a few videos on where they come from but most are just a step away from pretty intense proofs involving limits.

I need to provide some concrete examples of where the formulas come from. Maybe fill a pyramid up with some liquid and pour it into a cube with the same base? Let me know your strategies for helping students derive volume formulas.

Advertisements

4 thoughts on “Day 161: Practice

  1. I have had success establishing the 1 : 3 volume ratio for cylinders and cones by using Quaker Instant Oats. I empty a canister into a big bowl, fashion a cone with the same height and have the students fill the oats canister back up. It’s goofy and fun and seems to reinforce this ratio. This, however, is only helpful if they have the idea for the volume of a cylinder under control.

    Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s