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I'm sure I saw information about large, y-shaped aparatus for modelling 'part-part-whole' structures. But I can't remembe where and I can't find them.
Can anyone help?
Is it this - https://www.autopresseducation.co.uk/addition-subtraction-facts/234-partitioning-tree.html?
No - but I like it! Thank you so much for the link! :-)
Minimum order £30! Sigh!
Try putting a search into Pintrest. There are lots of ideas on there. I think the one you are thinking of is made of piping (the sort used in household pumbing).