Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
Ice Cream Numbers - preschool summer math that explores fine motor skills, counting, one-to-one correspondence, and more early math skills Mehr zur Mathematik und Lernen allgemein unter zentral-lernen.