Welcome to the 36th edition of

**Math Teachers at Play!**

How many rhombs can be traced on the edges of this figure? |

**square triangular number**? How common is that? 1, 36, then...?

8+9+9+10... will numbers like that have a special property? |

**Number**

Denise, the founder of this here carnival here, has an activity on Times Tac Toe at Let's Play Math.

Erlina at Mathematics for Teaching (formerly keeping Math Simple) has a nice introduction to integers based on sorting.

Can you see the four 9-squares and nine 4-squares in this brick? |

Marilyn at Mad Kane's Humor Blog had a Pi Day limerick. Given Pi Day's proximity to St. Patrick's Day, that's a double score.

*Bonus*: Math Jokes 4 Mathy Folks had mathy St. Patrick's jokes.

Pat blogged at Pat's Blog, hmmm, about Pi from a classic Venn illustration in 1888 to an internet meme cartoon from 2011.

John has fascinating info on a class of prime numbers called the Limerick Primes at the Endeavor.

How can you quickly determine if 1926 is a multiple of 36? Is it close? |

**Algebra**

Mimi at I Hope This Old Train Breaks Down... has a complete activity on (beyond) composition of functions, adapting and extending an NCTM activity, and also an idea for a neat telephone function composition activity. She's prolific, so poke around the blog while you're there.

Alexander, author of the amazing Cut-the-Knot, has a great discussion of inverse functions, relating three different

*Mathematics Teacher*articles at the CTK Insights blog.

How big is this 36 in real life? Why do you think so? |

**Geometry**

Becky at Wide Open Campus has a quick little activity called Nature's Pattern Blocks.

Chris at M.O.B. has an activity on Mirror Imaging Monsters. Arrrgh, reflectional symmetry.

Maria at Homeschool Math Blog has an excellent problem with a chord. Good challenge with a different perspective.

**Connections**

Katie has a travel site, Tripbase, with the nine most mathematically interesting buildings. I might make it ten for either the Plaza de EspaĆ±a or the Alhambra in Spain, both of which have some great tessellations. What would you add?

Cheong ponders Are You a Number? at Singapore Math.

**Representation**

Caroline at Maths Insider has a post on strategies for your visual, auditory or tactile learner.

Sue, writing at Math Mama Writes..., use graphs to make connections to increase her understanding of trig identities.

I never got a chance to clean up and make pretty this 36 knot that I designed for this carnival. Why on earth would I think that this somehow related to 36?

Why would 36 degrees be newsworthy? |

**Teaching and Learning**

Rachel at Quirky Mama has monthly math activities for preschoolers.

Maria at The Math Mom recommends a short post with 5 tips for not transferring your math anxiety or a long and serious post on if it's okay to be smart.

Peter has a collection of links to enthuse about math at Travels in a Mathematical World. Peter is half of the Math/Maths podcast.

Jacob tackles memory vs. mastery learning at License to Teach.

**What about this?**

Carson shared a nice graphic relating math to careers at When Am I Going to Use This? But it's at an online education site, which Dan Meyer wrote quite forcefully against, in terms of predatory recruitment, at dy/dan. He was writing specifically about the Top N lists. What do you think?

**The other issue to be on the look out for is the EduSolidarity online rally, March 22nd. If you don't stand for something, you'll fall for anything.**

**So Long and No Longer**

Sorry this was a wee bit late. I had a busy couple of days between Knot Fun (Celtic knot activity on axioms) and a Tech Symposium presentation, for which I assembled this glog (interactive poster) about the Tech I Use. See you next month inside Maths Insider hosted by Caroline. Submit an article!

Mathy pictures made in Geogebra. Other pix from Flickr - the photographer's name for each is in the file name. And a special MTAP shout out to Leo Reynolds, who has got to be the most prolific number photographer in history.

Looks great! Thanks for hosting.

ReplyDeleteI posted a link, and now I'm ready to enjoy an afternoon of browsing...

Excellent post, as always.

ReplyDeleteBrain teasers are are also a great activity.

ReplyDeletesquare triangular number? How common is that?

ReplyDeleteNot very common: http://oeis.org/A001110