Teacher demonstrates on overhead as students do activity on their own individual trading board.
Remember to place colored chips under corresponding section on board. Build this number on the second horizontal section of the trading board. To see how many chips we have altogether, pull down all chips in the red section below the double line. If more than 9, then we must trade 10 chips for one yellow chip and place that yellow chip in the next vertical column. Next, pull down all the yellow chips below the double line.