Welcome to my math blog! The purpose of this blog is to help you stay informed about our learning and experiences that have taken place during our math class. I have also included links your child (and you) may want to use in order to supplement math learning in 5th grade.

## Friday, April 10, 2015

### Graphing: Dot Plot

To make a dot plot in class, I wanted to have a little fun.  So, I posed the question...

How many drops of water will a penny hold?

I gave each of my six tables a penny, eye dropper, and a container with water.  I began by having them predict the number of drops.  This prediction is typically around 5... however, the actual data is much higher!

I circled the room, monitoring the drops of water.  The dropper cannot be too high from the penny, nor should it be too close.  The drops should not be tiny, in fact, they should all be about the same medium size.  Be sure not to wiggle the table... and so on and so on.

The kids were shocked to find that a penny holds quite a few drops of water.  This is because of the meniscus formed by the water, creating a "bubble" that rises above the penny.  This is due to surface tension.  Once the surface tension breaks... off flows the water!

We completed the experiment for both the heads and tails of the penny.  We gathered the data on our dot plots.  We found the range of the data.  Then we used the median number of drops as our "actual" number of drops of water a penny holds.

Dittrich