This is a functioning solar-powered plush calculator. It's a commercial product, available from, um...oh geez: "Silly Dilly Tot Spot."
Anyway. I'm interested in the idea that DIYers out there might be making their own functioning soft-circuit calculators, but there aren't any that I can find. (Opportunity!) I did find one interesting, albeit non-functional, plush calculator from Flickr user caffaknitted, as well as one more commercial version, both of which are shown below.
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