Sit side by side with the student at a table. You should be facing the same way so that you can each view the lesson from the same perspective.
Present the child with a number. You should trace the number with your fingers while saying the name of the number, much as you did when you first introduced the tactile numbers to the child. The child may repeat the name of the number with you, but if he does not that is okay. Once you have traced the number, invite him to trace it.
Introduce writing the number. Trace the number with your fingers again. Then immediately take the pencil and write the number on the paper, following the same directions that you used to trace the number. Once you have done this, allow the child to mimic your motions exactly. At this time, it does not matter how large or small she writes the numbers. She can make them any way she wants as long as she follows the same motions that she uses when tracing them with her fingers.
Allow the child to practice on her own. If he appears comfortable with the exercise, you may allow him to use more numbers. Watch discreetly to make sure that he is not picking up his pencil while writing the numbers or performing any other incorrect writing movements. This is one time that you should step in to correct a mistake immediately in order to prevent the formation of bad habits.
Encourage the child to continue writing numbers over subsequent days. She should be able to retrieve the tactile numbers, a pencil and paper entirely independently, and practice on her own once you have shown her the steps and she is confident with using them.