Monthly Archives: June 2012

Multiplication of Negative Numbers Recursive Continuation

Recently, the subject of how to teach or justify rules for multiplication of negative numbers has come out.  The following is an approach based on the Peano Axioms. Natural numbers are 0, S(0), S(S(0))), … 1= 0′. S(0) = 1 … Continue reading

Posted in Analtyic Continuation, Analtyic Recursive Continuation, Angela Chen Chronicles Higher Education, dy/dan Dan Meyer, Inductive Definitions, It Ain't No Repeated Addition, James Tanton Math Videos, Justin Reich, Keith Devlin Stanford, Khan Academy, Math Video Series, MTT2k, MTT2k Prize, Mystery Teacher Theatre 2000, Recursion, Recursive Continuation, Recursive Definitions, Recursive Inductive Definition of Multiplication, Recusive Inductive Definition of Addition, Uncategorized | 50 Comments

Re Austin Frakt High deductible health plans have a math problem

Austin Frakt has a very insightful post on the growth of health care premiums for low and high deductible plans.   He shows in a simple case that the percentage growth in the health care premium for a high deductible plan … Continue reading

Posted in Aon Hewitt, Austin Frakt Health Economist, Insurance Companies, Real World Algebra Problems, Tricky Exam Questions | Leave a comment

Jamie Dimon JP Morgan testimony and math tests for legislators

Jamie Dimon of JP Morgan Chase testified to the House oversight committee on financial services on Wednesday June 19, 2012.   http://www.c-span.org/Events/Banking-CEO-Returns-to-Capitol-Hill-to-Detail-JPMorgan-Chase-Losses/10737431681/ http://financialservices.house.gov/ He had testified to the Senate committee on June 13, 2012. http://www.c-span.org/Events/Banking-CEO-James-Dimon-Details-JPMorgan-Chase-Loss/10737431430/ http://banking.senate.gov/public/ This was in regards to … Continue reading

Posted in Bank Capital, Bank executives, dy/dan Dan Meyer, Finance Applications, House Committee Financial Services, Housing and Urban Affairs Committee, Jamie Dimon JP Morgan Chase, Timothy Gowers, Value at Risk | Leave a comment

Re dy/dan An Incomplete History Of The Math Edublogosphere

The blog dy/dan by Dan Meyer has a post titled An incomplete history of the math edublogsphere.  This has a comment thread of math teachers who blog and apparently regularly follow dy/dan. Number 7 Jeanette links to http://algebra1teachers.com/ This in … Continue reading

Posted in Common Core Standards Recursion, dy/dan Dan Meyer, It Ain't No Repeated Addition, Keith Devlin Stanford, Math Education Bloggers, Recursive Definitions | Leave a comment

Re Derek Thompson Forget Edison: This Is How History’s Greatest Inventions Really Happened

Derek Thompson of The Atlantic discusses a history of invention. Forget Edison: This Is How History’s Greatest Inventions Really Happened The world’s most famous inventors are household names. As we all know, Thomas Edison invented the light bulb, Alexander Graham … Continue reading

Posted in Derek Thompson The Atlantic, Law Professors Patents and IP, Mark A. Lemley, Science Journalists | Leave a comment

Re Lisa Gartner Fairfax to base 40% of teacher evaluations on student progress

Lisa Gartner at the Washington Examiner reports that Fairfax County Virginia will now base 40 percent of teacher evaluations on student “achievement”.  This was the minimum they were able to use under New Child Left Behind. Fairfax to base 40% … Continue reading

Posted in Fairfax County Performance Evaluations, Fairfax County Public Schools, Fairfax County Teacher Evaluations, Lisa Gartner Washington Examiner, Teacher Evaluations | Leave a comment

Re: AP WaPo Independent bookstores embrace digital publishing with ‘espresso’ book machine

Washington Post talks about print on demand at independent bookstores of independent authors. WaPo story based on AP My comment there: This is an interesting option.  I would like to support independent bookstores.   I have an e-book out on Pre-Algebra … Continue reading

Posted in Book Piracy, Espresso Book Printing, Politics and Prose bookstore, Washington DC bookstores | Leave a comment