Teach them the letters with magnetic letters. Teach them to count by counting on their fingers with them. Teach them things like tying their shoes as all things are interconnected in learning how to learn. But make sure that it does not become boring tedious and a chore, make it fun. Change the activities and games often even if the objective or task is the same.
Repetition is the key.
Another way to teach is to get books and videos that match. A very nice woman whose daughter began writing her name at age 4 whom I met in Denver recommended highly Dr. Suess books and the videos. I have the Dr. Suess videos Green Eggs and Ham, The Cat in the Hat along with the videos and computer games. Kyla loves all of them. Several times I have had Hooked on Phonics recommended to me.