Giveaway: Hexa-Trex Puzzle Book

Bogusia Gierus, host of this month’s Math Teachers at Play blog carnival, is offering to give away her First Book of Hexa-Trex Puzzles for just the cost of shipping. How generous!

My math club had fun with several of these puzzles a few years ago, and the “Easy” ones (like the sample shown here) were just right for my 4th-5th grade students. One girl enjoyed them enough that she took home extra copies to share with her father.

It’s a thin book, just the right size for a stocking-stuffer. To see the full range of difficulty levels, look over the puzzles on Bogusia’s Daily Hexa-Trex page. To get your own copy of the book, read the giveaway instructions on Bogusia’s blog.

Object of the Puzzle

The object of the puzzle is to find the equation pathway that leads through ALL the tiles.

Forming Equations

  • Two or three (or four or five etc.) digit numbers are made up of the individual tiles in the particular order as the equation is read. For example 5 x 5 = 2 5 is correct, but read backwards 5 2 = 5 x 5 is incorrect.
  • The equation must be continuous (no jumping over tiles or empty spaces).
  • Each tile can be used ONLY ONCE.
  • Order of operations is followed. Multiplication and division comes before addition and subtraction.
  • The tile “-” can be used as both a subtraction operation or a negative sign in front of a digit, making it a negative number.

howtosolveproblemsWant to help your kids learn math? Claim your free 24-page problem-solving booklet, and sign up to hear about new books, revisions, and sales or other promotions.

Math Teachers at Play #44 via Nucleus Learning

by fdecomite via flickr

The new Math Teachers at Play blog carnival is up for your browsing pleasure:

If you think the carnival seems shorter than usual, you’re right. We had many more submissions, but it appears that the blog carnival website is having trouble again. If your article is missing (as mine is), I’m sorry! Please try again next month.

This is the first time I ever hosted a blog carnival so please bear with me.

While reading the posts submitted to this month’s Math Teachers at Play blog carnival, I was struck by how visualization is very important in teaching math, and just math in general. I was happy to read all the “visualization” posts since my recent interest is exactly in visual representations and how they help in learning, especially learning math.

For instance…

Go read the entire article at Nucleus Learning.

Free Learning Guide Booklets


Claim your two free learning guide booklets, and be one of the first to hear about new books, revisions, and sales or other promotions.


What to Do with a Hundred Chart #27

[Photo by geishaboy500.]

It began with a humble list of 7 things to do with a hundred chart in one of my out-of-print books about teaching home school math. Over the years I added a few new ideas, and online friends contributed still more, so the list grew to its current length of 26. Recently, thanks to several fans at pinterest, it has become the most popular post on my blog:

Now I am working several hours a day revising my old math books, in preparation for publishing new, much-expanded editions. And as I typed in all the new things to do with a hundred chart, I thought of one more to add to the list:

(27) How many numbers are there from 11 to 25? Are you sure? What does it mean to count from one number to another? When you count, do you include the first number, or the last one, or both, or neither? Talk about inclusive and exclusive counting, and then make up counting puzzles for each other.

Share Your Ideas

Can you think of anything else we might do with a hundred chart? Add your ideas in the Comments section below, and I’ll add the best ones to our master list.


howtosolveproblemsWant to help your kids learn math? Claim your free 24-page problem-solving booklet, and sign up to hear about new books, revisions, and sales or other promotions.

Triangular Numbers: Sum from 1 to N

Kitten and I covered triangular numbers a couple months ago in our Competition Math for Middle School book, but I think it’s time to revisit the topic. I like the method James Tanton gives in this new video:

Continue reading Triangular Numbers: Sum from 1 to N