100 creative math activities for toddlers, preschool, and school age kids. Hands-on, multi-sensory ideas, organised by topic and theme. (Not sure they are all early math.
How to dye pasta for a rainbow sensory tub: Rainbow color sorting activities for toddlers and preschoolers
25 Sensory Bottles for Toddlers featured on Play Ideas (Bottle Bag Sensory Play)