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!
Create a Peek-a-Boo Sensory Board for your toddler to explore could make this a matching sensory activity. Can be used for toddler who have sensory issues and also a way for parents to help interact with the their children.
Stone Activities for Kids - Happy Hooligans. *Always pack a sharpy and you can draw on rocks "on the go." Or when the kiddos find the ones they wish to use, just whip out the marker and have your kids help draw on the rocks.