Place a strip of both capitalized and lowercase letters at eye level all around the preschool classroom. Help the children reference this strip as they learn to recognize and try to write out familiar upper and lower case letters.
Help the kids to form letters with their fingers in multiple ways. For example, have them form different letters with items such as soft clay one day, pipe cleaners another day, and magnets or cotton balls on a different day.
Set aside time daily to sing songs that contain sequences of letters, like the traditional "ABC" song. Play songs or videos that contain learning material about letters that the children can watch or listen to.
Count toys and items as you place them on the table to help support the methods of counting. For example, when asking a preschooler to set out a pencil for everyone, have everyone participate in counting how many pencils are on the table. If you lay out piles of objects, let the children take turns in counting how many items are in each group.
Play games that include passing objects from one preschooler to the next. For example, pass around apples, oranges or bananas. Count them as they go around and then eat them. Use rulers to allow the preschoolers to start recognizing numbers and measurements and allow them to measure random items in the classroom.