Formation of Numeral 11-19 with Teen Boards Purpose: To associate the numbers eleven through nineteen with the symbols 11 to 19 Age: 4.5-5 years old Material: ... Formation of Qty 11-19 with Bead Material Purpose: To teach the names of the numbers 11-19 using the Bead Material Age: 4.5-5 years old Material ... Constructive Triangles - Triangular Box Purpose: To show the various triangles contained in an equilateral triangle. To discriminate geometric forms. To develop growth in concentration and indepe ... Constructive Triangles - Rectangular Box A Purpose: To show the quadrilateral figures formed by various triangles. To discriminate geometric forms. To develop growth in concentration and independenc ... Constructive Triangles - Rectangular Box B Purpose To show the quadrilateral figures formed by various triangles. To refine the child's perception. To develop growth in concentration and independenc ... Color Sorting Game Purpose: Identifying color and to visually discriminate different shades of colors Age: 3-4 years old Material: ... Stereognostic Bag Purpose: Develop the child's visual and tactile sense. Material 1 cloth bag with 10 pairs of geometric solids, such as sphere, cube, sphero ... Addition Purpose: To help the child understand the process of addition is simply the combining of equal or unequal quantities to form one large quantity. Age: ... Decimal System Bead Material Purpose: To help the child become familiar with the quantities and hierarchies of the decimal system. Age: 4 - 5 years old  ... Large Number Cards Purpose: To help the child recognize the written (abstract) symbols for the decimal system quantities. Age: 4 - 4.5 years old ...