Abstract: Templates for identifying equivalent fractions in one example comprise a plate defining a plurality of aligned rows, each row having an equal length and representing a respective fraction. Each row defines a number of slots through the plate, positioned to divide a row into equal parts corresponding to the respective fraction. Slots or markers in respective rows corresponding to equivalent fractions are vertically aligned. An elongated slot may be provided on the template or on a separate template to draw a boundary to mark a fraction, identify equivalent fractions and perform mathematical operations. In another example, a first template includes a plurality of aligned rows with marks to indicate fractions and a second, transparent template for placement over the first template. Fractions may be drawn in a Unit box defined on the second template. Methods of using a template, and virtual templates, are also disclosed.

Abstract: Templates for identifying equivalent fractions in one example comprise a plate defining a plurality of aligned rows, each row having an equal length and representing a respective fraction. Each row defines a number of slots through the plate, positioned to divide a row into equal parts corresponding to the respective fraction. Slots or markers in respective rows corresponding to equivalent fractions are vertically aligned. An elongated slot may be provided on the template or on a separate template to draw a boundary to mark a fraction, identify equivalent fractions and perform mathematical operations. In another example, a first template includes a plurality of aligned rows with marks to indicate fractions and a second, transparent template for placement over the first template. Fractions may be drawn in a Unit box defined on the second template. Methods of using a template, and virtual templates, are also disclosed.

Abstract: A template set includes a first template for drawing the contour of a three-dimensional shape and a second template for drawing the visible and invisible edges of the three-dimensional shape. The first template has a plurality of apertures, wherein each aperture has a periphery circumscribing an area, the periphery representing the contour of a pictorial representation of a three-dimensional shape. The second template has a plurality of sets of linear apertures, wherein each set of linear apertures corresponds to a respective aperture in the first template. The linear apertures include continuous linear apertures which are used to draw solid lines representing visible edges within the contour, and intermittent linear apertures which are used to draw dashed lines representing hidden edges within the contour.

Abstract: A template set includes a first template for drawing the contour of a three-dimensional shape and a second template for drawing the visible and invisible edges of the three-dimensional shape. The first template has a plurality of apertures, wherein each aperture has a periphery circumscribing an area, the periphery representing the contour of a pictorial representation of a three-dimensional shape. The second template has a plurality of sets of linear apertures, wherein each set of linear apertures corresponds to a respective aperture in the first template. The linear apertures include continuous linear apertures which are used to draw solid lines representing visible edges within the contour, and intermittent linear apertures which are used to draw dashed lines representing hidden edges within the contour.

Abstract: A data entry device, including a plurality of sensing devices worn on a user's fingers, and a flat light-weight keypad for transmitting signals indicative of data entry keyboard functions to a computer or other data entry device. The sensing devices include sensors are used to detect unique codes appearing on the keys of the keypad or to detect a signal, such as a radar signal, generated by the signal generating device mounted to the keypad. Alternatively, sensing devices may be mounted to the keypad to determine the location of a user's finger upon selection of a keypad key. Pressure sensitive switches, one associated with each finger contain resistive elements and optionally sound generating means and are electrically connected to the sensors so that when the switches are pressed they activate a respective sensor and also provide a resistive force and sound comparable to keys of a conventional keyboard.

Abstract: A data entry device, including a plurality of sensing devices worn on a user's fingers, and a flat light-weight keypad for transmitting signals indicative of data entry keyboard functions to a computer or other data entry device. The sensing devices include sensors are used to detect unique codes appearing on the keys of the keypad or to detect a signal, such as a radar signal, generated by the signal generating device mounted to the keypad. Alternatively, sensing devices may be mounted to the keypad to determine the location of a user's finger upon selection of a keypad key. Pressure sensitive switches, one associated with each finger contain resistive elements and optionally sound generating means and are electrically connected to the sensors so that when the switches are pressed they activate a respective sensor and also provide a resistive force and sound comparable to keys of a conventional keyboard.