Patterns and Design
Fraction Circles and Numerals
Age: 4 & up
Prerequisites: Association of number rods to numerals; matching fraction circles.
Screen objects: Numerals from 1 to 10 down left side of screen. At bottom of screen are ten matching fraction circles placed in random order. All of these circles are colored red to match the physical fraction circles. Next to the left hand column is a column of circles. These circles are simply red outlines with no lines to indicate sectors.
Presentation: (Individual or small group)
Variations: Matching the numerals to sides of a polygon.
Extensions: Sectors and numerals matching.
Points of Interest: Matching the fraction circle to the numeral.
Control of Error: System responds by counting sectors when circle is placed in outline (darkening them and counting out loud). If count does not match numeral to its left, the circle falls back down to the bottom of the screen.
Direct Aims: Symbol association.
Indirect Aims: Preparation for recognition of external angles of regular polygons.
Software Affordance: The association of the number rods to numerals requires teacher verification. This exercise uses control of error to support the child's autonomy.
Software Constraints: The sectors of the fraction circles cannot be removed from the circles. The sectors, circles and numerals cannot be rotated.