Patent ID: 11928321
Assignee: nan
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. Apparatus for identifying equivalent fractions, comprising:
a first plate defining a plane and a plurality of aligned first rows, each first row having an equal length and representing a respective fraction;
each first row having a first side, a second side opposite the first side, a top side, and a bottom side opposite the top side, wherein the first sides of each first row are vertically aligned and the second sides of each row are vertically aligned;
each first row defining at least one mark on the plate, the at least one mark being fixedly, and non-movably, arranged in the plane containing the first plate, each of the at least one mark being located in a position in the row to divide a respective row into a number of equal parts corresponding to the fraction defined by the respective row, the number of parts being equal to a value of the denominator of the fraction defined by the respective row,
wherein marks in rows corresponding to equivalent fractions are vertically aligned; and
a second, transparent plate separate from the first plate, the second plate defining a boundary having the same dimensions as the marks on the first plate, wherein, when the second plate is placed on top of the first plate, the second row aligns with a selected one of the first rows, wherein a line or other indication is drawn on the second, transparent plate when in alignment with marks on the first plate by a writing implement.