I asked Limerick the other day what was, in his opinion, one of the neatest things he knew about math and numbers.

In response he told me he thought the neatest thing was that if you start with the powers of 2 (say, 128 for example) and kept dividing by 2 (32, 16, 8, 4, 2, 1, 1/2, 1/4, and so on, he said), you would go on forever and never actually reach 0.

Basically my five year old uncovered on his own the concept of an infinite series approaching a limit and (very naturally!) decided it was just about the coolest thing numbers do. I love how his brain processes numbers and analyzes the world in their light!

We’ve been working on place value for a while. Rondel unfortunately decided that my default place value game was his least favorite thing ever, probably primarily because Limerick utterly loves it and finds it intuitive and easy while Rondel has struggled more with the concept. Fortunately, however, we were able to adapt it using place value blocks (wooden blocks in denominations of one’s, ten’s, hundred’s, and a huge thousand cube) into a game that let each kid operate on their own level of mathematical ability while working together to earn chocolate chips!

Our goal as a team was to reach 1000, rolling dice to add to our total on each turn. Along the way, we could get chocolate chips: one for each person every time we added a new hundred square, and ten for each person if we made it to the thousand cube. On Aubade’s turn, she would roll just one die and practice counting the dots to find how many she had rolled, then practice counting again as she put the right number of cubes onto our combined tower in the center.

On Limerick’s turn, he rolled two dice, multiplied them together, and then added his total to the combined tower. (Yes, this is easy for him. Next time I’ll have to come up with something more challenging for him to do! He also tends to supervise everyone else, however.)

On Rondel’s turn, he rolled four dice and added them all together (which was perfect for him! Adding two dice is easy for him at this point, but four lined up with the addition we’d been encountering in Life of Fred and he remembered and mentioned that.) Seeing how his one’s cubes lined up to form a group of ten, and how his ten’s lines added up to form a hundred square, the concepts of place value finally started to make sense to him! These blocks are such a nice visual/tactile representation of that ðŸ™‚

By working together, we eliminated both the stress of competition and the need for everyone’s individual rolls to come out to, on average, comparable amounts. Because we were working together, it didn’t matter if Aubade was rolling much smaller numbers than Limerick or Rondel, or that Limerick’s highest possible total was higher than Rondel’s – everyone just contributed towards our shared goal in their own way. It also didn’t matter who was fastest or reached a goal first, and the shared celebration every time an intermediate goal was met (i.e., the chocolate chip for each hundred) prevented anyone from becoming jealous or discouraged. And finally, because none of those things were important to the game, we could tailor it to each participant’s math level, allowing all three kids to play together despite ranging from counting to multiplication/division with their math skills (which I’ve found surprisingly difficult, mostly when it comes to including Aubade in the game.)

Inspired by one of Limerick’s class experiments at our co-op, we spent an afternoon watching baking soda and citric acid react explosively in our kitchen ðŸ™‚

One thing I really liked about the way his co-op teacher presented the baking soda/lemon juice reaction was that she asked a lot of questions designed to help the kids come up with hypotheses and logically critique those hypotheses. Each lemon volcano had three components: the lemon, the food coloring (to make it look more like lava!), and the baking soda. So she asked them what they thought made the eruption happen, for example, and when a lot of the kids said the baking soda, she pointed out that the baking soda wasn’t making fizzy bubbles when it was all by itself in the bowl!

So when we replicated and expanded upon the experiment at home (Rowan was so jealous that Limerick got to do it at co-op and he didn’t!), I tried to ask similar leading questions. We also decided to test other citrus fruits with the same reaction, so I had the kids think about the differences between the fruits and guess which would make the biggest reaction beforehand, so we could compare our hypotheses with our results.

To my surprise, the two types of oranges we tested had drastically different results. The big navel orange was even less reactive than I’d expected, while the small juicing orange was almost as explosive as the lemon! The grapefruits were also quite dramatic, being overripe and thus extremely juicy and very fun to squeeze everywhere to create great “lava flows” of fizzy reactive liquid. I do think the lemons were still the most reactive, although the results were not anything like quantitative ðŸ˜›

While we didn’t draw chemical diagrams and get into the atomic reason acids and bases react, we did have a lot of fun exploring the reaction itself! It’s such an easy and exciting way to see how different types of substances can interact.

While the kids were playing together, I set up an activity for the next lull in their imagination. Pulling out two of our giant whiteboards, I quartered them and placed a biome card (from our Waseca materials) into each of the eight sections: Oceans, Wetlands, Tropical Forests, Temperate Forests, Grasslands, Desert, Mountains, Polar Regions. Pulling out the box of toy animals, I began sorting them into the biomes: zebras in Grasslands, tigers in Tropical forests, dolphins in Oceans.

It wasn’t long before Rondel came out and was instantly engaged, asking if he could help sort the animals. So we sorted together, talking about which biomes would make the most sense for animals which are domesticated, for example, or adapted for a range of habitats. When we had at least a few animals in each biome, I brought out the biome question and answer cards.

There were six questions altogether (asking about temperature, moisture, soil, plants, animals, and humans), and each one had an answer for each biome, so Rondel’s task was to match each answer to the correct biome after I read the card. He only needed help on one or two of the cards, and showed a good conceptual understanding of how the environment differs between biomes, how plants and animals have adapted to different biomes, and how humans have interacted with biomes in different ways (both positive and negative).

I noticed that our animal representation was heavily skewed towards African grasslands and oceans; the Waseca teacher’s guide recommended using animals cutout from magazines, which would increase the diversity, but I didn’t have any that I was willing to cut up. I may just need to buy a big batch of old National Geographics or ZooBooks off of Ebay – old magazines can be really useful craft and learning supplies!

This activity was a good summary of the information we’ve learned about biomes as well as a good overview before diving into more detail on any one area; I think we’ll explore animal adaptations next but I have a lot of ideas.

Rondel really enjoys looking for treasure (thing-finding in the tradition of Pippi Longstocking, where almost anything can be considered treasure), and as I pondered what to do with our morning (unexpectedly open since Aubade had too bad of a cold to handle the hike we’d planned), I thought he might enjoy following a series of clues to find a treasure at the end.

Because there is always some way to incorporate math, reading, and handwriting into life’s activities (please take that with some humor!), I decided that each clue would be a numerical cipher but that the numbers in the encoded message would have to be determined by calculating a series of math problems. I made short messages like “under the desk” and “lego box”, converted them to series of numbers using a key, and then came up with arithmetic problems at Rondel’s level. He started out with the key and the first clue, which led him to the second clue, then to the third, and all the way to the treasure after six clues in total (probably about 50 math problems all together, which is a lot more than he’d normally do otherwise!). In addition to the math, he got a lot of handwriting practice in from writing down the numerical answer to each problem as well as the corresponding letter value from the cipher, and then even got to do a bit of reading to put all those letters together for each clue.

Above are two examples of keys and clues – the orange set was for Limerick and the red set was for Rondel. Changing the key values to larger numbers would let you create even more difficult math problems without needing to alter the method of encryption. Limerick kept commenting on how the problems corresponding to the letter “A” – where the answer was 1 – were too easy, and a different key value would have eliminated that issue.

Rondel did a whole treasure hunt, despite the difficulty of focusing with two younger siblings running around at high volume and also being very interested in everything he was doing and not giving him any quiet or space! I was really impressed with his determination and motivation, because nothing about this was easy for him but he didn’t give up.

The sound-reduction headphones were a huge help! I could see him relax and focus more easily the instant he put them on.

Limerick wasn’t interested at first, because he isn’t all that into finding treasure, but he like the idea of following a path of math clues so I made a set for him later and he finished his as well! He does not like to write or draw often so pulling him into an activity where he writes this much is a rare and pleasant thing (I think he couldn’t resist the math).

One thing I did notice from the activity was that both boys have legibility issues, and I’m going to have to find a way to work with them on pen grip and letter formation that hopefully doesn’t result in daily fights. Rondel’s letters in particular are like people, each with their own personality and opinions, and they dance around the page and swing by their toes and jump on each other’s heads and sometimes sword fight – and they are highly offended by the idea that they should arrange themselves in a neat orderly line! So if you have any ideas or suggestions I would love to hear them.