Sit side by side on the floor with the child. This will help you both view the lesson from the same perspective. This is useful because it will make it easier for the student to mimic your actions later when they do the lesson on their own.
Place a single ten bar in front of the child. Because this is a similar to many other exercises with the golden beads, the child will likely volunteer, "This is ten." If he does not, you may ask him. It is important that he is familiar enough with golden beads or bead bars to count the beads or otherwise identify that it is ten.
Place two ten bars beneath the first ten bar. As you do so, ask the child what the bars are. She will likely respond, "Two tens." You should answer, "Yes, that is two tens. We call two tens twenty."
Place three ten bars beneath the two ten bars. As you do so, ask the child what the bars are. He may respond "Three tens," or he may indicate that he does not know if he is not familiar with thirty but has figured out that there is a new set of numbers being taught. Either way, you will respond, "This is three tens. We call three tens thirty." At this point, you will have three ten bars lined up side by side, beneath two ten bars side by side, beneath a single ten bar.
Have the child identify the ten bar groups by name. You may ask for them first in order, then out of order. Work with the child until she can recall ten, twenty and thirty.
Mix up the ten bar groups to test recall again.
Continue to add quantities until you have reached 9 ten bars in a group. Depending on how comfortable the child is with this lesson, you may need to do this over one or several days. The ten bars should always be lined up side by side so that they get closer and closer to creating a square. In this way, the child will be able to watch as a hundred square is built. Once the child is comfortable with the material, she can work on it on her own.