These 12 stackable & nestable cups are uniquely designed to deliver a surprising load of creative and pre-math benefits. Cups are volumetrically correct & sequentially sized for interaction. Volumes can be added or subtracted. For example, Cup #1 + Cup #3 = Cup #4. Fill & dump, stack & nest, match & sort, mold & st
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A favorite toy of my kids and grandkids. Bought it for a gift.
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Linda · October 21, 2026
12 cups as opposed to 8 with cheaper sets; also brighter colors.