Tag Archives: Main Line Classical Academy

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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Playing with symmetry in kindergarten

In our kindergarten classroom, there is a big mirror that is usually covered by a giant map.  And for good reason!  As soon as the students find themselves anywhere near the mirror, it attracts them like a magnet.  They make … Continue reading

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3-digit numbers are tricky! Part II

This is a follow-up post to this one, about introducing 3-digit numbers to kindergartners. I start this lesson by asking the students to come up to the board one by one and write down consecutive numbers starting with 100.  There … Continue reading

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3-digit numbers are tricky!

For the past several weeks, our kindergartners have been playing with 2-digit numbers: they made numbers out of base-10 blocks, wrote them on the board, translated between the two representations, counted by 10’s from different starting points, and more.  We … 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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