## Fun with pentacubes

Today we started a unit on geometry with the second graders.  The first activity had them explore how many different structures can be made out of 4 snap cubes.  They very quickly came up with the five tetrominoes: After a … Continue reading

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## A number talk that turned into an investigation

It all started out with 12+12+12 a problem that was not particularly difficult for any of my 1st/2nd grade students.  The students took turns suggesting strategies for doing this computation and I recorded them on the board (this was an … Continue reading

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## Logical Fun, Part II

Here is the long overdue follow-up post to Logical Fun, Part I. The previous post left off with the following logic problem being posed to the students: A man is looking at a portrait.  A passerby asks him whose picture … Continue reading

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## Logical Fun, Part I

Once a week, I teach a joint math class at my school which combines children of ages 6-10.  For these lessons, I generally try to pick an activity that I can present as a series of “problems” of increasing difficulty … Continue reading

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## Fibonacci Trees

For two weeks in a row, in our joint 1st-5th grade math classes, a certain famous sequence made its appearance.  The activities were seemingly very different: in the first one we were climbing stairs one or two steps at a … Continue reading

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## Four colors or more?

When you find your students working during break time on a problem that was the topic of a lesson three weeks prior, you know that something has gone right and your heart is filled with joy and excitement. What they … Continue reading

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## Great Mathematicians, Old and Young

Almost every week, I read or tell my second grade class a story about a famous mathematician.  Recently, we have been reading from the book Mathematicians Are People Too: Stories from the Lives of Great Mathematicians and the students have been … Continue reading

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## I come before you!

Today I had two really fun lessons on the same topic, one with the kindergartners and the second one with the 2nd and 3rd graders combined.  The topic was “when does order matter?” and I began both classes with a … Continue reading

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## As many opinions as there are shapes: fun with “Which one doesn’t belong – A shapes book”

Last week, the main theme of both my Kindergarten and my second grade math classes was geometry.  We did a number of activities that explored various shapes and their properties, but the biggest hit in both classes was Which one … Continue reading