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Category: Geometry

The Artistic Side of Math – 180-degree Rotational Symmetry

The Artistic Side of Math – 180-degree Rotational Symmetry

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Crossword puzzles are symmetrical?! That’s usually the response I get after students have been given a chance to look through blank crossword puzzles I’ve cut from the paper. Then I show them how all crosswords are designed with 180-degree rotational symmetry. Starting with 90-degree rotational symmetry, we rotate an object 1/4 the way around the circle. See photo below. Then we rotate an additional 90 degrees so that we end up with a turn of 180-degrees. (We’ve done work in…

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Project-Based Learning – Target Practice: Teaching the Area Formula for a Circle

Project-Based Learning – Target Practice: Teaching the Area Formula for a Circle

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Meaningful math with a purpose! This great hands-on lesson gets students doing math while designing targets. Students become comfortable using the area formula for circles. And the best part is, their targets are set up and used during the school’s fall carnival. Watch the video below for the entire lesson plan. CCSS: 7.G.4 TEKS: 6th grade 6C, 8A, 8B Link to video. .

The Artistic Side of Math – Area

The Artistic Side of Math – Area

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This is one of my favorite math and art activities. That’s because it involves a mathematical pattern. Using centimeter graph paper, we start with the basic unit which, in this case, is simply one square. I then ask students what they think the area would be if we doubled the size of the square. The first thing they blurt out before thinking is “two”. I then use the graph paper to show them that if I double the square (double…

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3-D Geometry

3-D Geometry

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Kids love geometry. It’s so hands-on. At least, it should be. I can’t imagine trying to teach kids geometry without letting them draw, cut, design, build. 3-D geometry taught on paper? I don’t think so! Unless, of course, you’re designing nets. And that’s exactly what I did with a group of sixth graders. We were working on volume and I thought it would be fun to re-design the soda can. It required a lot of hands-on work that involved graph…

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The Artistic Side of Math – Cubism

The Artistic Side of Math – Cubism

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During a unit on 2-dimensional geometry I use art to tie in the polygons we’ve been studying. I share a variety of paintings by the artist Pablo Picasso and we talk about the shapes they see. Then, using the idea of straight lines and hard edges, students create their own work of Cubism out of construction paper.