This rainbow color sorting sensory bin is a great indoor activity for toddler and preschoolers. They work on colors, sorting and fine motor skills. A hidden way to make color sorting a self motivated activity!
KELS MK & Toddler & Preschool - This shape sorting game is excellent for shape recognition. It can also be done with number, shapes, etc. Simple and different. Easy to make RIOA appropriate. Just another way to sort.
The Ultimate Guide to Hands On Toddler Activities - Brittany Estes--- This could also work for pre-math skills. Which shape has more or less? I would put on magnets on the back and have a magnetic work space for them to do this activity!