## Discovering the area of a trapezoid

Below is a guest post by Dmitry Bryazgin (originally written in Russian). Dmitry runs a small math circle near Princeton for students in grades 3-5. On the particular day described in the post, there were 4 students present. The main … 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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## Exploring Rectangles

Friday is a special day in our math classes at the Main Line Classical Academy.  We read and discuss mathematical stories and we do exploration projects.  Here is the project that we did with the 2nd-4th grades last Friday. It … Continue reading

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## Just how many prime numbers are there?

Over the past few months, my 4th and 5th graders had a number of opportunities to explore prime numbers and factoring – they drew factor trees, discovered divisibility rules, played Prime Climb, and more.  Last Sunday, I decided that they … Continue reading

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