Free Winter Math Activities... snowman adding game, thermometer sequencing, and more
pesticide demonstration - plant absorption makes it impossible to wash pesticides off of food.
q-tip painting . . . count by 10s 100th day activity
monster math games Monster Math Games & Activities with loads of free printables for preschool, kindergarten, and first grade make one for letters and one for numbers children separate magnetic letters/numbers into proper monster!
Homemade sensory play dough playdough with natural diy colorings from natural ingredients you probably have in your fridge and spice drawer
Make your own story dice for the kiddos or as a gift!
60+ Free Math Worksheets & Games for Preschool-4th Grade covering addition, subtraction, multiplication, division, place value, and more!
The Chocolate Muffin Tree: Rock Tower Bakery. Sorting, stacking, building, counting. Rocks make wonderful natural math manipulatives.