Joss Ives ask for a list of my Math Circle activities for young children. What Joss asks for, Joss gets, so here is a blog post on the activities. Also, my wife wants a list of the activities we did in January and February, so I get to kill two birds with one stone with this post (Note: my usual communication with my wife is not via this blog).

Procedure: We meet once per month in a room at the public library. I usually run two 30-minute sessions, with three to seven kids attending each session. Their parents are rarely in the room, although it happens on occasion.

I stole most of these ideas, mainly from Math from Three to Seven by Alexander Zvonkin and Math Circles for Elementary Students by Natasha Rozhkovskaya. I also steal ideas from Talking Math with Your Kids by Christopher Danielson. I am trying to cite every place where I stole ideas, but I am sure I am forgetting. Please contact me if I should be giving you credit.

Disclosure: I have met Christopher and I am friends with Natasha, but no one has paid me to link to anything in this blog post (or any others).

Here are the activities.

Day 1

1. I gasked questions like “Are there more geese than birds?” and “Are there more women than moms?” I wanted them to start thinking about set containment.

2. I showed them pictures of, say, a bunch of dolphins (and also cats) that look similar (I drew them). I asked, “Is it true that there exists a dolphin with a ball?” “For all cats, the cat has an umbrella?” The purpose is to get them thinking about quantifiers.

3. I showed them a geoboard. I put a geometric design on the left half, and they had to do the mirror image on the right half.

Day 2

I taught them to use Base Ten blocks with the help of a puppet named Yachel. I told them that Yachel is afraid of the number “ten,” so he does not to see ten of anything. The kids organized the Base Ten blocks into groups of ten so that there would be only one big group, rather than ten small groups (so Yachel wasn’t afraid). They kept doing this until all of the blocks were organized. In the end, I asked them to guess how many blocks there were (something like 1287), and I showed them that they can actually tell exactly how many of them there are by just counting how many big groups of each type they made.

I don’t know how much the kids learned about the Base Ten number system, but Yachel was a *huge* hit; my kids still treat him like he is one of the family.

Day 3

I read them a book called something like *5 Cats*, in which the cats categorize their family members into different groups (3 are male and 2 are female; 1 is black, 2 are white, and 1 is calico; etc). I brought hula hoops, and then I asked questions so that the kids could sort themselves (“Stand in that hula hoop if you are wearing something blue today.”). This was a bit of a flop.

Day 4 (March 2016)

This was a Pi Day celebration. I found a bunch of circular lids of different sizes, and cut up a bunch of pipe-cleaners so that they were the length of the diameters of the lids. Then I hot-glued googly eyes on them, and called them “Diameter Worms.” I made up a story about how Diameter Worms find circles to live in, just like hermit crabs. The Diameter Worms need to have a circle that is exactly the right size for it. Then I asked them to figure out how many Diameter Worms can lie end-to-end around the outside of their circle home. First, they made a prediction, then they actually wrapped the worms around the home. Of course, everyone learned that “a little more than three worms” could fit around, regardless of the size.

I don’t know how much they learned about pi, but it started a Diameter Worm craze in my son that lasted for several months.

Day 5

1. More work on subsets and quantifiers, as we did in Day 1.

2. I did something with 3×3 patterns, but I don’t remember what.

3. I gave students cut-out polygons and scissors, and they had to do certain challenges. For instance, cut quads into 2 triangles, or cut a quadrilateral into 2 quadrilaterals, or cut a quadrilateral into a triangle and pentagon.)

Day 6 (11/2016)

1. We did Danielson’s Which one doesn’t belong?

2. We played Nim on graphs, which is a game developed by Marie Meyer and me for her senior thesis.

Day 7 (12/10/2016)

We played (in an unstructured way) with Base 10 blocks (there were only two kids that week).

Day 8 (January 2017)

1. Danielson’s How many? to get at the idea of units.

2. We talked about “Doot Aliens.” When Doot Alien A touches Doot Alien B’s nose (which makes a “Doot!” sound), both Aliens disappear and some Doot Alien C reappears in its place (A-Doot-B always results in the same C, although B-Doot-A might not result in C). There are Ghost Aliens such that A-Doot-Ghost yields A, as does Ghost-Doot-A. I asked them: “What happens when one Ghost touches another Ghost’s nose?” They didn’t come up with the answer, but a couple of them have asked me about Doot Aliens (without me prompting) since then.

3. I gave them a bunch of statements like, “The sky is blue” and “There are seven people in the room,” and I asked them whether each statement was true or false. Then I asked about “This sentence is false.”

4. More of Danielson’s Which one doesn’t belong?

Day 9 (February 2017)

One-cut hearts to celebrate Valentine’s Day (plus, one-cut stars to celebrate Betsy Ross).

Day 10 (March 2017)

I am working a new Pi Day activity, but I haven’t thought of it yet.

Tags: Kids, Math Circles

March 3, 2017 at 12:26 pm |

These are great! I especially love the honesty about when things don’t go great, we all need to be honest with each other more about that stuff.

Here’s my question: What if Joss asked you to lie while saying “I am not lying”?

March 3, 2017 at 1:31 pm |

“Here’s my question: What if Joss asked you to lie while saying “I am not lying”?”

Well, now I will be spending my entire spring break trying to figure out how to answer your question.

March 3, 2017 at 3:13 pm |

It sounds to me that you are saying Joss and your wife are two birds 🙂

Love the post, Bret! I also love the fact that your kids are slightly older than mine so I can use the material you prepared.

March 3, 2017 at 4:05 pm |

Excellent stuff, thank you for sharing!

March 7, 2017 at 3:27 am |

Wow Bret. A lot of great activities in here. I have somebody in my house that I predict will become obsessed with one-cut origami. For some of the other activities I will have to be patient until she has some peers around to let them explore the space.

Also, I am humbled to have a blog post be in response to a request! Even if Andy has taken it in a sideways direction 😉

March 7, 2017 at 3:39 am |

Yeah, we can always count on Andy to ruin special moments like this.

Keep me posted on how your kids like one-cut shapes!

March 7, 2017 at 1:40 pm

hey now!

March 7, 2017 at 2:59 pm

J/K! I loved your comment, Andy.

March 13, 2017 at 3:12 pm |

So far one cut origami has been a huge hit. I will let you know what other successes we have 🙂

March 13, 2017 at 3:20 pm |

Which shapes have you done?

March 13, 2017 at 3:24 pm

Just a bunch of different hearts. She uses them for crafts. The very cool thing is that the piece you cut off from Yamamoto’s Heart No.1 can be quickly trimmed to make a smaller square and then another smaller heart created to make a “heart family”

March 13, 2017 at 3:28 pm

Cool! I am going to work some more with them at home on this now. Thanks for the inspiration!