2. The black and white bead stair.
3. A quantity of negative bead bars, (for the first presentation have this quantity equal the number of colored bead bars.) Negative bead bars are small gray wooden beads on wires the same as the colored bead bars.
4. Golden ten bars.
5. A small notched card of cardboard or plastic to serve as a counter.
6. Each set of bead bars should have its own container.
7. A mat or pad on which to work.
2. Show the child how to obtain the material.
3. Place the mat on the table, the four containers at the top of the mat with the colored bead bar and negative bead bar containers side by side.
4. The container of golden beads should be near the black and white bead stair.
5. Lay out the colored bead bars, alternating with negative bars.
6. Explain that the colored bead bars are to be added, the black and white bead bars are the remainders (or left over), and the negative bead bars are to be taken away.
2. Begin at the beginning of the snake and count with the counter as in the Positive Snake Game, placing the golden ten bars and black and white bead bars for remainders.
3. As the colored bead bars are replaced by ten bars and black and white bars, place them in the container at the top of the mat.
4. When the first negative bar is reached explain to the child that this amount must be taken away from the golden bead bars or from the black and white ones that go before it.
5. Count back the number of negative beads on the bar, remove the negative bar and the beads counted back, using black and white bead bars as place holders.
6. Continue until all beads have been removed and the snake eliminated.
2. Match a positive bead bar to a negative bead bar of the same quantity. State, "Six take away six is zero." First match all pairs, then mix quantities to make combinations which are equal.
2. Positive beads replaced by black and white or golden bead indicate that they may be replaced by the negative beads.
2. Taking away by going back.
3. The four kinds of beads being used.
4. Watching the snake disappear.
5. Noting that the snake equals zero.
6. Placing the bead bars for verification.
7. Placing the beads in the proper boxes.
8. Learning words such as positive, negative, snake, remainder, subtract, etc.
2. Concrete representation of negative functions.
3. Preparation for algebra (equal quantities of opposite sign eliminate each other.)