When we talk about combinations in the English language, we have a problem. People regularly use the word "combination" when that isn't what they mean at all. Combinations are a collection of things when the order DOES NOT matter. Choosing which 3 stuff animals out of a collection of 10 to take with you on a trip is an example of a combination. A combination lock is a great example of using … [Read more...]

# Tumbling Dice: A Great Game That is Great Math Practice

Tumbling Dice is an exciting game of dexterity (and some luck), but it is also great for practicing addition and multiplication facts. It is no longer in print, but it is easy to make your own. I made a fairly nice one out of wood using these instructions, but you can make one out of a stack of books or any other flat objects. How to Play: The first player places a die on the … [Read more...]

# Math Picture Books

There are lots of great math picture books out there. I wanted to share some of our favorites from our library. The books get increasingly more difficult in concepts and reading level as you go through the list - starting with a preschool series and ending with geometry concepts. Preschool/Early Math learning Series: Great Source Mathstart books have three different levels. These books are … [Read more...]

# The Mathematics Of A Reading Chair

We recently bought a very large bean bag chair that was a lightning deal on Amazon. Instead of the traditional bean bag filling, it has little chunks of memory foam in it. The kids love to curl up in it to read, which was the main reason that we purchased it. I thought that one child at a time would sit in it to read, but they have enjoyed piling 3 or 4 of them in it. Since it was … [Read more...]

# Circles That Roll (But Not Like You Think)

I have listed a few of my favorite YouTube channels in previous posts, but I neglected to mention Numberphile. Numberphile posted a new video a few days ago, where Matt Parker showed how linked circles can roll. He demonstrates how it works and how far the circles must overlap. They must be overlapped the correct amount so that the center of mass of the two circles does not move up and down. … [Read more...]