Place value teaching device
View Patent ↗An improved numeracy and place-value educational device which accurately displays a range of both whole-number and decimal place-value properties. A conventional counting-wheel odometer comprising a plurality of sequentially numbered counting wheels ( 10 a - 10 f ) and motion transfer components (not shown) is supported by a frame ( 12 ). A decimal carrier ( 20 ) moves laterally across a portion of the frame ( 16 ). The lateral movement allows a decimal point ( 20 ′) to precede or follow any numeral in a specific row displayed by the counting wheels ( 10 a - 10 f ). A place value band ( 18 ) displays place value names ( 19 a - 19 f ). Its movement, in unison with the decimal carrier ( 20 ) and a moveable comma ( 241 , maintains the correct orientation of place-value names ( 19 a - 19 f ) in relation to the decimal point ( 20 ′) in unalterable fashion. Force is applied to the motion transfer components which selectively rotate the counting wheels ( 10 a - 10 f ). A sequential, dynamic display of both whole-number and decimal place-value names, notations, and properties is presented consistently, accurately, and objectively.
1. A conventional odometer assembly of the type comprising a plurality of counting wheels with outer annular surfaces, each of said counting wheels having a sequential series of digits spaced evenly apart on said annular surfaces, motion transfer component means between said counting wheels for receiving and transferring rotational force, an axle means for rotatably securing said counting wheels adjacent to one another, a support means for supporting said axle whereby said counting wheels may freely rotate, and a means for transferring said rotational force to said motion transfer components, the improvement comprising,
(a) a display means whereby a decimal point symbol and a plurality of place value names are displayed in unalterably correct relationship to one another,
(b) said display means also providing means for lateral repositioning of said decimal point symbol and place value names in relationship to said digits so that said decimal point symbol and place value names remain in said unalterably correct relationship to one another, and
(c) a support means to support said display means at predetermined height in relation to said digits so that said decimal point symbol maintains an elevation that is within reasonable proximity to the traditional location of such said decimal point symbol in relationship to said digits.