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It is an attempt to make math class "inclusive."  IMO, it's just a waste of time.

 

I never saw it in any textbook until SM.   We read through it in one day and did a couple of the exercises out loud.  I couldn't figure out the point of covering it.  I could see if my kids said oh wow this is so fun and puzzly, but neither of them did.  So I just always wondered why on earth an entire chapter was dedicated to it. 

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I never saw it in any textbook until SM.   We read through it in one day and did a couple of the exercises out loud.  I couldn't figure out the point of covering it.  I could see if my kids said oh wow this is so fun and puzzly, but neither of them did.  So I just always wondered why on earth an entire chapter was dedicated to it. 

 

By SM, do you mean Singapore? Because I'm pretty sure the the first time I saw it was in Saxon.

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Saxon?!  I have a hard time believing that.  I did not see the elementary Saxon books though so maybe.  It just does not strike me as a typical Saxon topic. 

 

I definitely saw it in Singapore Math. 

 

I just checked.  Yup, it's in Saxon 6/5--Investigation 12.

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They're in MEP too. I love them but I'm a self-diagnosed aspie. I see tessellations everywhere. Wallpaper and linoleum dazzle me. They do seem pretty pointless though. On second though, they're good for demonstrating how the angles in a quadrilateral add up to 360 degrees. Since any quadrilateral can tessalate (try it), all four corners meet at a point with no gaps and thus demonstrate that the angles of the original quadrilateral add up 360 degrees. There are probably proofs to be made for the interior angles of other polygons to but quadrilaterals are the most straight forward. This conversation is making me drool. I need to go play with some geometry tiles. :)

 

 

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I replied in the other thread but I don't think you saw it. There has been some good research linking ability in spatial awareness to later maths ability. So being able to mentally rotate shapes, discern background and foreground, and understand perspective are all important for later maths. I am pretty sure someone linked an article fairly recently about it, how a small intervention in the early days could have big payoffs. 

 

I used a handwriting program from the UK for my daughter (write from the start, I believe?) which focused on spatial stuff. I was astonished that, for example, in a page of pictures she couldn't tell what was foreground and what was background. It was just so obvious to me. 

 

However, we covered tesselations in year ten. That is a bit late I reckon. I would say that playing with tesselations as a little kid, preschool, kindergarten, using real tiles and maybe building up complexity over time would be the most effective. 

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