Tag Archives: geometry

Equal Shmequal

A few days ago, Katie came home from a party with 3 Oreo cookies.   In the evening, she asked to have one of them with her milk.  Permission was granted.  As she was finishing up her munching, Katie asked … Continue reading

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Build and Describe

Two weeks ago in class we did an activity we called “build and describe.”  This is how it worked: First all students got an identical set of blocks (initially two or three, depending on age group).  Next, one student built … Continue reading

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Fun With Multiplication?

For the past few weeks in class, we have been exploring multiplication.  A few months ago, we had learned about and practiced skip counting, so this time around we started by discussing why this might not always be practical or … Continue reading

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Nets and Decorations

For the past two weeks, we have been continuing to explore 3D objects, and more specifically their nets.  During the first lesson, we played with the nets of a cube.  The kids were given pictures of hexominoes (arrangements of 6 … Continue reading

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From 3D to 2D and Back

Last class we explored how 3-dimensional objects can be represented in 2 dimensions.  We started with a brief study of the cube; we counted the number of faces, vertices and edges (for some of the younger kids, this was not … Continue reading

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Counting Rectangles

This week we continued playing with rectangles, but this time we were counting them.  This can be more tricky than it sounds.  I started the lesson by drawing a single rectangle on the board.  The kids all agreed that there … Continue reading

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Cutting Corners (take 2)

After we determined what a rectangle was, we started exploring what would happen if we try to slightly alter it.  A rectangle has four angles, what happens when you cut off an angle?  How many angles does the resulting figure … Continue reading

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What is a rectangle?

By age 4-5, most kids can easily recognize a rectangle.  However, ask even a 4th grader (haven’t tried it with older kids) to describe what one is without drawing anything or using hand gestures and you get some interesting answers.  … Continue reading

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It all depends on how you look at it.

Objects often looked different when viewed from different angles.  A fun, and often non-trivial, activity is to draw an object as viewed from the front, side, top, etc.  This week in class, we used cubes from the puzzle game Q-bits … Continue reading

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Pentaminoes

Last Sunday at the Golden Key Russian School, we did a fun and engaging activity involving pentaminoes.  Pentaminoes are shapes made out of five squares connected along edges.  There are 12 of them up to rotations and reflections: These shapes … Continue reading

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