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# Tag Archives: recreational math

## Abby’s Puzzles

My ten-year-old daughter asked me for help doing a mathematical STEM-fair project. We had a lot of funny doing the project together. Here is a brief description of what we did. We decided on the following question: “How many decominoes … Continue reading

Posted in computers
Tagged elementary education, kids, math, mathematics, pentominoes, polyominoes, programming, puzzles, Python, recreational math, STEM, STEM fair, tiling
11 Comments

## A Case of Accidental Symmetry

The other day I was thinking about putting dominoes onto a 4-by-4 grid without any of the dominoes contacting each others’ sides. I wanted to know how many dominoes you could fit onto the 4-by-4 grid in this way, and … Continue reading

Posted in polyominoes
Tagged algorithms, binomial coefficients, combinatorics, domino, dominoes, grids, math, mathematics, maths, polyominoes, Python, rec math, recreational math, recreational mathematics, symmetry
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## Partitions of Graphs IX: The case of 13

This is the ninth in a series, the first being here: Part 1, and the previous here: Part 8. Here is a Q1 graph for n=13 o / o-o-o-o-o-o-o-o-o-o \ o-o The corresponding Q1 partition is 5+5+3. Unfortunately this … Continue reading

## Partitions of Graphs VIII: The case of 11 (and 17)

This is the eighth in a series, the first being here: Part I and the previous here: Part 7. We have shown that there are no Q1 graphs with n=5 nodes or with n=7 nodes. Also, in the case of … Continue reading

## Partitions of Graphs VII: The Cases of 5 and 7

This is the seventh in a series, the first being here: Part I, the previous here: Part VI. In the previous post I defined a Q1 graph to be a graph G with q(G)=1. We found examples of Q1 graphs … Continue reading

## Go Figure

I’ve only looked through this book a little so far, but it looks awesome. My 7 and 5 year old have looked at it and had fun and I learned several math facts I didn’t know from it today. I … Continue reading

Posted in math
Tagged books, math books, math education, mathematics education, recreational math
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## Baseball

Happy Ruth-Aaron days!

Posted in math
Tagged baseball, integers, math, mathematics, numbers, recreational math, ruth-aaron numbers
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## My Grandmother

In college I learned that there are different sizes of infinity (actually I had heard this in high school, but didn’t understand what it meant, nor had I heard anything about why it was true). I thought that I could … Continue reading