Teacher Zone - Free Library of Math Video Lessons. Math Teachers at Play 61. Researching 61 as a number tells us it's not just prime, but is a twin prime, a cuban prime, the 9th Mersenne prime exponent, and a Pillai prime. That's primo prime pedigree. It's a Keith number and thrice Fortunate. (Fortunate numbers are pretty interesting and the subject of an open conjecture.) It's a centered square number (1+4+8+12+16+20), a centered hexagonal number (1+6+12+18+24) and a centered decagonal number (1+10+20+30); mostly because it's neighbor 60 is so nice. (Did you see the 60th Math Teachers at Play?) Is there a reason that , and overlap at 60? The Euler Zig Zag number for n is the number of alternating permutations (up-down-up-down arrangements) on n ordered objects. Early LearnersPreschool Math Ideas from Lilac at Learners in Bloom. Make Me Dinner from Jennifer Bardsley at Teaching My Baby to Read. ElementaryCenter Idea For Building Addition Fluency at Zoom Zoom Classroom.
Skip-bo Addition Game (or The Funnest-est Bestest Math Game Ever) from Amy at Ita Vita. 61? Math Games. Math for Smarty Pants. Maths Resources. MATHTRICKS. Mathematics Fun, Fact, Fiction, Function, Fantasy. Here is a collection of mathematical activities and curiosities...enjoy them! BRAND NEW 2008 Line of Fractal Imagery -- 594 Images -- Oh Wow! ---> Show me the fractals! Extensive Graphical Spherical Harmonic Study --- 640+ Images ---> Take me there!
2006 Line of Fractal Imagery -- 336 Images -- Gotta See Them ---> Let's go there! Guess Your Birthday! Here's a fun trick to show a friend, a group, or an entire class of people. I have used this fun mathematical trick on thousands of people since 1963 when I learned it. Step 1) Have them take the month number from their birthday: January = 1, Feb = 2 etc. Have them give you the total. How It Works: Let M be the month number and D will be the day number. Thus, if you subtract off the 165, what will remain will be the month in hundreds plus the day! By the way, if you wish to know how many minutes and seconds you have been alive and lots more about when you were born, you might like to try this website ==> Birthday Calculator Divisibility Rules! 20 Incredible TED Talks for Math Geeks | Bachelor's Degree. Challenge of the Week. November 26 – December 3, 2010 A teacher announces that a test will be given on one of the five days of next week, but tells the class, "You will not know which day it is until you are informed at 8 am of your 1pm test that day".
Which day will be the exam given? Submit your solution to challenge[at]math.washington.edu. The winner of this week's Challenge Problem receives a gift certificate for Baskin Robbins Ice Cream! The Challenge Problem is posted every Friday in the afternoon (every other Friday over the summer). For questions, comments, or suggestions for future challenge problems, or to be added/removed from the email list: please email challenge[at]math.washington.edu. The challenge problem is maintained by Mauricio Duarte, Sudip Paul and Erik Slivken. The Museum of Mathematics.