
Recent Posts
Now Publicizing on Twitter
 Graphing Sampling Error for Ordinal Data jrh794.wordpress.com/2017/04/11/gra… https://t.co/ls7FV3F2eQ 2 weeks ago
 Command Index to Statistical Rethinking jrh794.wordpress.com/2017/03/21/com… 1 month ago
 FOIL is Verboten jrh794.wordpress.com/2017/03/14/foi… 1 month ago
 Here’s What You Don’t Get to Do jrh794.wordpress.com/2017/03/13/her… 1 month ago
 Derooting with Radicals jrh794.wordpress.com/2017/02/17/der… 2 months ago
Archives
 April 2017
 March 2017
 February 2017
 January 2017
 December 2016
 November 2016
 October 2016
 August 2016
 May 2016
 March 2016
 February 2016
 January 2016
 December 2015
 November 2015
 September 2015
 July 2015
 June 2015
 April 2015
 March 2015
 February 2015
 January 2015
 December 2014
 November 2014
 October 2014
 September 2014
 August 2014
 July 2014
 June 2014
 May 2014
 April 2014
 March 2014
 February 2014
 January 2014
 December 2013
 November 2013
 October 2013
 September 2013
 August 2013
 July 2013
 June 2013
 May 2013
 April 2013
 March 2013
 February 2013
 January 2013
 December 2012
 November 2012
 October 2012
 September 2012
 August 2012
 July 2012
 June 2012
 May 2012
 April 2012
 March 2012
 February 2012
 January 2012
 December 2011
 November 2011
 October 2011
 September 2011
 August 2011
 July 2011
 June 2011
 May 2011
 April 2011
 March 2011
 February 2011
 January 2011
 December 2010
 November 2010
 October 2010
 September 2010
 August 2010
Categories
Page Names
Meta
Monthly Archives: October 2010
We Take a Field Trip
Last week I took my class on a field trip. I had everyone in class think of the last digit of their phone number. I told half of them to put a minus sign in front of that number. Then … Continue reading
Posted in Pedagogy
Leave a comment
When Not to Use an Equal Sign
I keep thinking about equal signs – when to use them and what do they mean. Here is an example of when not to use an equal sign. p = plane I require that students define their variables when they … Continue reading
Posted in Curriculum
Leave a comment
“FOIL” Multiplication Is Overrated
Today my class decided that the “foil” method of multiplying two binomials is overrated. The following diagram contains the series of steps that I took them through. In step one I asked them to multiple 78 by 26 by hand … Continue reading
Posted in Curriculum, Pedagogy
1 Comment
A Short Grammar Lesson
Once a week I require my students to write up several problems using correct grammar. Yesterday I wrote this on the overhead. 1 is the loneliest number. I asked the class what was wrong with this sentence. No response. Many … Continue reading
Posted in Curriculum
1 Comment
An Experiment with WolframAlpha
I have been thinking about equal signs lately (The subject of a forthcoming blog entry) and decided to see what WolframAlpha thought. Here is my first try. If you give WolframAlpha an equation like without instructions, it responds with the … Continue reading
Posted in Math and Me, Rants
Leave a comment
My Fraction Rant
It is a common complaint among math instructors that entering freshman do not know how to add, subtract, multiply or divide fractions. Judging by the look on their faces I would say that they actually fear them. The reasons, I … Continue reading
Posted in Curriculum, Pedagogy, Rants
Leave a comment
Factoring Trinomials – A Road Not Usually Taken
Let’s factor . Did you get ? [You can check this on WolframAlpha. Just copy and paste: (sqrt(10)x+sqrt((2*i*sqrt(30)13)x)+i*sqrt(3))(sqrt(10)xsqrt((2*i*sqrt(30)13)x)+i*sqrt(3)) into the search box.] Usually we find simpler linear factors when we factor a trinomial. In our case we would get or … Continue reading
Posted in Math Explorations
1 Comment