Place Value Board
date: label: date made
content: 1968
name: label: maker
content: Naidorf, Robert
notes: label: Description
content: This is a device for introducing elementary school students to the concept of place value. Six parallel wires, each in the shape of an inverted U, fit into holes in a wooden block that serves as a base. Each wire carries nine beads. The beads on the front of the wire represent digits. A tape that runs across the block contains labels for the wires - from one on the rightmost wire to hundreds of thousands on the leftmost. Robert Naidorf (born 1961), the son of the donors, made the object in about 1968. It was used by Marjorie Naidorf, Robert's mother, as a third grade teacher at Parklawn Elementary School from 1971 until 1991. Place value boards are also sold commercially.
label: Location
content: Currently not on view
place: label: place made
content: United States: Virginia
topic: label: Subject
content: Mathematics
label: Subject
content: Women's History
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Women Teaching Math
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content: Abacus
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content: Learning Arithmetic
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content: Science & Mathematics
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content: Arithmetic Teaching
creditLine: label: Credit Line
content: Gift of Sherman L. and Marjorie A. Naidorf
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2005.0055.01
label: catalog number
content: 2005.0055.01
label: accession number
content: 2005.0055
objectType: label: Object Name
content: abacus
physicalDescription: label: Physical Description
content: steel (overall material)
label: Physical Description
content: wood (overall material)
label: Physical Description
content: tape (overall material)
label: Measurements
content: overall: 15.8 cm x 26 cm x 7 cm; 6 7/32 in x 10 1/4 in x 2 3/4 in