I love these letter and number foam puzzles set. We use them ALL YEAR long - especially for water play. Lately Little Bear has been loving our ice activities, so I decided to freeze his foam number in a block of ice for him to excavate.
The night before we did this science activity, I froze the numbers in a container full of water. The next day I put the block of ice into the sensory bin with a hammer, screwdriver, and room temperature water (colored with food coloring to see the difference between the warm water and the ice).
I couldn't find our droppers so I filled a few water bottles and drilled holes into the caps. Squeezing the bottles to release the water turned this a really fun fine motor activity.
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