I think we had a pretty successful parent night last night! It was great to meet so many parents and talk with them about how their students were using math at home, what some of their concerns were, and informally meeting with the students to ask them what they liked and disliked about math and let them know some of the things that we could work on together.

There was one question that I heard a number of times, and that was "Does the math program really work?" This is a very difficult question to answer in a few short minutes, and I'm really not here to debate the issue. However, I do believe that the students are making fantastic progress and are liking math, and that is mainly due to the way it is being implemented.

I thought I would share a couple informational links with you.

The National Council of Teachers of Mathematics has a list of family resources that are intended to explain how many of the newer math programs are intended to work and why. They have answers to homework issues, why calculators are used in class, and other common questions: http://www.nctm.org/resources/families.aspx.

The What Works Clearinghouse from the Institute of Educational Sciences (part of the US Department of Education) has a report after looking at a number of programs and charting student progress. There is also a link to their summary on Everyday Math.

## Thursday, September 18, 2008

## Wednesday, September 17, 2008

### Plots and Graphs

At this time of the year there is a period of review. One of the questions I was recently asked was about the term "mean" instead of "average". That is a common question as many of us were taught using the term 'average'. In simple terms: An average is the relationship a number has to the arithmetic mean; while the mean is the actual value when averaging numbers (finding the central point in relationship to all numbers).

For example, if the arithmetic mean of a set of numbers is 75, a value of 80 may be above average while a value of 76 may still be considered average.

Averaging the numbers in a set of data results in finding the mean. Much like multiplying a factor pair results in finding the product.

I give a brief explanation of data terms, as well as an example of both a line and stem&leaf plot in the voicethread video below.

For example, if the arithmetic mean of a set of numbers is 75, a value of 80 may be above average while a value of 76 may still be considered average.

Averaging the numbers in a set of data results in finding the mean. Much like multiplying a factor pair results in finding the product.

I give a brief explanation of data terms, as well as an example of both a line and stem&leaf plot in the voicethread video below.

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