• A Visual Proof

    Updated: 2012-05-29 22:03:56
    I found a strange piece of paper in an old pile. I believe that it is a visual proof of the following statement: If ∞ = 1/0, then 0 = 1/∞. Proof. Assume ∞ = 1/0. Rotate each side of the equation counterclockwise 90 degrees. We get 8 = −10. Subtract 8, getting 0 [...]

  • Did You Notice?

    Updated: 2012-05-29 21:57:38
    I recently posted a short article on plagiarism. Did you notice that not a word of it was mine? a2a_linkname="Did You Notice?"; a2a_linkurl="http://blog.tanyakhovanova.com/?p=405";

  • Happenings – 2012 May 26

    Updated: 2012-05-26 18:35:36
    It’s been another relatively uneventful week. On the one hand, I have done no further work on color… so I have nothing new from Kang’s “computational color technology”, which was the impetus for the last color post, although it ended up as a very minor part… and I have not continued looking at complementary colors, [...]

  • Matchsticks game

    Updated: 2012-05-22 12:42:04
    Matchsticks game is a fun geometric game with matches.

  • Video Flash Cards: Multiplication

    Updated: 2012-05-19 17:53:28
    I have added 10 new videos to a playlist on YouTube showing my new series of Video Flash Cards for multiplication. These would be handy for students to learn their times tables. I include all tables from 0-12 for sale, but videos only show 1-10. Here is link: http://www.youtube.com/playlist?list=PLFB7456A84CFA0138 The videos come in 2 sizes, [...]

  • Happenings – 2012 May 19

    Updated: 2012-05-19 16:48:28
    Well, the past week has been quiet, in more ways than one. There have been only 2 earthquakes in my immediate vicinity from last Saturday through yesterday… for the month of May, this brings the total to 10. I made a little progress on the next regression post – the 1st of 2 about the [...]

  • austin

    Updated: 2012-05-17 01:55:45
    Shawn was training for a hot dog contest. He trained for 6 days and each day he ate 4 more hot dogs. At the end of 6 days he had ate 150 hot dogs. How

  • pre algebra

    Updated: 2012-05-17 01:44:02
    liz, kyle, and sarah collected empty cans for a recycling drive. kyle collected 12 more cans than liz. sarah collected 2 times as many cans as liz. if

  • Happenings – 2012 May 12

    Updated: 2012-05-12 18:05:53
    Well, I slept through another earthquake last night. Ho-hum. It was merely a 2.5 instead of the 4.1 I slept through last week. There were 4 earthquakes of at least magnitude 2.5 in the Bay Area through Friday. If my counting is correct, we are up to 8 so far in May… not counting the [...]

  • A Median Coin

    Updated: 2012-05-09 19:29:54
    Baron Münchhausen is famous for his tall tales. My co-author Konstantin Knop wants to rehabilitate him and so invents problems where the Baron is proven to be truthful from the start. We already wrote a paper about one such problem. Here is a new problem by Konstantin: Kostya has a [...]

  • Happenings – 2012 May 5

    Updated: 2012-05-05 18:12:58
    According to the USGS, I slept through a magnitude 4.1 earthquake last night. Okay, strictly speaking, all they vouch for is that there was such an earthquake… I’m responsible for the assertion that I slept through it. The frequency seems to be up recently: there have been 7 earthquakes in the Bay Area since last [...]

  • Story word Problem: linear equation

    Updated: 2012-05-03 20:20:18
    A salesperson earns a $200 per week in base pay plus one-twentieth of his/her dollar sales volume. Find the salesperson’s dollar sales volume if he/she

Current Feed Items | Previous Months Items

Apr 2012 | Mar 2012 | Feb 2012 | Jan 2012 | Dec 2011 | Nov 2011