Wednesday 17 June 2015

Nets of 3D Objects



I don't think my kids have done much with nets before. It's important to be able to represent 3D objects in this way.

I was keen to see what they could do so we got out some equipment to have a play.

Here are a few of the 3D objects we looked at and some of the drawings the kids did:

Cube


Suggestion #1 - like a rectangle with a square off the side.



Suggestion #2 - Like a cross




Suggestion #3 - lots of square bits



Suggestion #4 - A cross made up of 6 smaller squares 


So we had the general idea that the net of a cube is made up of lots of squares - just not too sure about the details.


Tetrahedron



Suggestion #1 - it's a triangle with some stripes


Suggestion #2 - it's got more than 1 triangle



Suggestion #3 - think I've seen one before with a square and triangles coming off it





So we don't really have a very good idea about this one. Lots of opportunity to learn here.

Cylinder



Suggestion #1 - it's got 2 circle shapes on top of each other



Suggestion #2 - It's definitely got 2 circles somewhere



Suggestion #3 - It's got circles AND rectangles



Suggestion #4 - yep, I've seen this one before



As teachers, we learn so much from the "fails" of our students. The "correct" responses are fine but they don't in themselves give us much insight into the mathematical thinking of the students.

BUT the errors, the mistakes, the ones that aren't quite right - they are the ones that tell us so much about what our kids are thinking and how they "see" mathematics.






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