Presentation of the Decimal System  Exercise
2
Passing 9 Game
MATERIAL:
 9 unit beads
 9 ten bead bars
 9 hundred squares
 1 thousand cube
 1 green felt mat
PURPOSE:
 To help the child understand the decimal system, by giving the
idea that every time you pass "nine" you go to one of the next
hierarchy.
AGE:
 4 to 5 years
EXERCISE:
 The teacher takes the materials to the child's table and spreads
the mat on the table. The teacher takes the units and places them
one by one in a line in front of the child, as though she were building
a ten bar:

 The child counts the units as she does so. "1, 2, 3, 4....to
9." When 9 is reached, the teacher says, "We have 9.
If we had one more there would be 10." She removes the 9 beads
and puts a ten bar in front of the child.

 She takes the box of 10 bars and places the 10 bars side by side
on the mat while the child counts, "1 ten, 2 tens, 3 tens,
etc. When 9 tens have been counted the teacher says, "We have 9
tens. If we had one more ten, there would be 10 tens. Ten
tens make one hundred." She removes the ten bars and puts a
hundred square in front of the child.

 The teacher puts out the hundreds, one at a time, on top of each
other as though building a cube, while the child counts, "1 hundred, 2
hundred, 3 hundred..." to 9 hundred. The teacher then says, "9
hundred. If we had one more hundred, we would have 10
hundred. Ten hundred make one thousand." The teacher puts
the thousand cube in front of the child.

 This exercise should be repeated as long as the child is enjoying
the lesson. It should be repeated on subsequent days. The
material must be kept available for the child to use on his own.