## Math Teachers at Play #93 via Math Misery? Blog

The December math education blog carnival is up for your browsing enjoyment:

The carnival is short this month, but full of treats. Enjoy!

“So here we are on December 23, 2015, the 93rd edition of Math Teachers At Play! As per tradition, what’s so fascinating about the number 93?

“First, it’s a prime number! No. Wait, that’s clearly false. So 93 is not a prime number. But that’s not very fascinating. Aha! But 93 is a semi-prime! since 93=31×3. Even more interesting is that 94 and 95 are semi-primes. So a question is, is there another triplet of positive integers that are also semi-primes? It’s a good question to ask your students! …”

CREDITS: “celebrate trees” photo (top) by Lauren Manning via Flicker (CC BY 2.0). Claim your two free learning guide booklets, and be one of the first to hear about new books, revisions, and sales or other promotions.

## Giveaway: Professor Povey’s Perplexing Problems

Do you have high school students, or do you enjoy puzzles yourself? Did you agree with my post last week, that Professor Povey’s new book looks like fun? If so, I’ve got some good news.

Oneworld Publications is offering a free copy of Professor Povey’s Perplexing Problems to two winners who live (or have a mailing address) in the United States. All you have to do is answer this question:

Do you have a favorite math or physics book?

### How to Enter

Update: The giveaway deadline has passed, but I’d still love to hear about your favorite book—‌I’m always looking for something new to read. :)

Don’t delay—‌the deadline for entries is Monday, September 28!

Remember: This giveaway is open to entrants with a U.S. mailing address only.

And don’t forget to leave your comment down below…

## Math Teachers at Play #84 via Math Hombre

Rectangles, fractions, prime factorization, dancing, puzzles, great books, and so much more — check out all the fun at the March Math education blog carnival:

But Before You Go…

I’m running out of carnival hosts! Would you like to volunteer? It’s a bit of work, but great fun, too. Leave a comment here, or send me an email.

Excerpt:

Welcome to the 84th Math Teachers at Play Blog Carnival!

84 is a portentous number. It’s the sum of twin primes (What’s the previous sum of twin primes? Next?). It’s thrice perfect, twice everything. It’s positively Orwellian. It’s even a town in Pennsylvania.

84 puzzler 1:
Number the intersections of these five circles with the integers 1 to 20 so that the points on each circle sum to the same.

It was a good month for math reading related posts …