Carnival of Mathematics 69 (via JD2718)

Jonathan serves up plenty of fun in this month’s Carnival of Mathematics. And he will be hosting the Math Teachers at Play blog carnival in two weeks — submit your entries here.

Carnival of Mathematics 69

Normally a Carnival of Mathematics opens with a discourse on its ordinal. But 69?

It is 1000101 in binary, 1011 base 4, 105 base 8, 45 in hex… If we used 32 as a base?  25. And that would be 15 in base 64.

69 is odd. But there are as many odd numbers as there are ________. I still love that!  It is one of a bunch of surprises that Dave Richeson lists  at Divisio …

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via JD2718

Math Teachers at Play #29 via The Number Warrior

After a slight delay, the new Math Teachers at Play carnival is up at The Number Warrior, with a nice variety of blog posts to browse. Enjoy!

Math Teachers at Play #29 The last time I hosted Math Teachers at Play I attempted to start a tradition of including a math puzzle pertinent to the number of the carnival. Alas, it didn't take, but now that I'm hosting again I can mention an old classic: Three people check into a hotel. They pay $30 to the manager and go to their room. The manager finds out that the room rate is $25 and gives $5 to the bellboy to return. On the way to the room the bellboy reasons that $5 … Read More

via The Number Warrior

A Little Bit of This, a Little Bit of That…

funny pictures of cats with captions

It’s high time I got back on track with my Alexandria Jones posts, so I’ve been working hard on a short introduction to probability, to go along with The Birthday Surprise. Or, more honestly, I’ve been procrastinating on a short intro … well, anyway, here’s a little of what I’ve been reading around the interwebs lately.

Continue reading A Little Bit of This, a Little Bit of That…

Math Teachers at Play #28 via CTK Insights

There’s plenty to enjoy at this month’s Math Teachers at Play blog carnival. Check it out:

This is a Math teachers at play carnival, issue #…which I am going to reveal shortly. See if you can make it from what is known as a single image stereogram. Try focusing your eyes behind the screen.

In this month’s issue: What is the number of this issue? … Sad news … Interesting and relevant news … From the trenches … Math curiosities … Jokes … P.S. … Read more

via CTK Insights

Mathematics and Multimedia Blog Carnival #1

The new math carnival is up, and it’s a good one. Check it out!

Also, remember that Wednesday’s the deadline to send in your submission for the Math Teachers at Play carnival, coming this Friday now posted at CTK Insights.

Mathematics and Multimedia Blog Carnival #1 THE NUMBER 1 Welcome to the Mathematics and Multimedia Blog Carnival Number 1. Before beginning, let us see what's so special about 1 as a number. is a homophone of Juan (dela Cruz), the person who represents the Filipino people.  He is just like Uncle Sam of the United States. Hmmm… just a thought, should we change Juan dela Cruz to Manny Pacquiao? is the multiplicative identity. Any number multiplied by 1 is equal to that number. is the only … Read More

via Mathematics and Multimedia

How To Host a Blog Carnival

[Photo by ell brown.]

Update March 2012

The blog carnival website has been unreliable for several months, which is why you will see strike-through on the paragraphs below that deal with that site. Please read the current information on these pages:

Do you want your blog to grow? One of the best ways to draw new readers to your blog is to get involved in an active blog carnival. Mike wrote an excellent article (What is a Maths Carnival?) explaining how carnivals work and how to submit an entry.

Now, if you’re ready to raise the ante a bit, let’s bring the carnival itself to your blog.

These instructions are specifically about the Math Teachers at Play (MTaP) blog carnival for classroom teachers, homeschoolers, and independent math learners. After all, that’s the carnival I know best. Still, most of the principles should apply to any blog carnival you might want to host.

Continue reading How To Host a Blog Carnival

How To Start a Math Teacher Blog

[“Sophisticated Blogger” by Mike Licht, NotionsCapital.com.]

Blogging is more than just writing. It involves reading other people’s blogs and commenting, comparing thoughts about mathematics and ideas for teaching it, even getting involved in debates like the multiplication is or isn’t repeated addition kerfluffle. In a way, the blogging community acts like the Chinese “teaching research groups” mentioned in Liping Ma’s book, Knowing and Teaching Elementary Mathematics.

What a coincidence! I wrote that paragraph last week for Math Mama’s book, and then this weekend I opened my backlogged rss reader to discover a series of posts from some of my favorite math bloggers offering excellent advice on how to start a blog.

If you are a classroom teacher, homeschooler, or independent math learner who would like to get into blogging, check out these posts. And if you’re an experienced hand, please add your favorite blogging tips in the Comments section below.

Continue reading How To Start a Math Teacher Blog

Math Teachers at Play #27 via Math Mom


The carnival is up at Ramblings of a Math Mom, a day late but well worth the wait:

Mathmom herself wrote a wonderful post for the carnival, which I was glad to see. I’ve missed her!

You May Also Enjoy

Here’s a puzzle I found to fritter away time while I was waiting for the carnival:

[Warning: The answers are in the same blog post, so don’t scroll down until you’ve tried the puzzle!]