Place Value Board

Description
This is a device for introducing elementary school students to the concept of place values. 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.
Location
Currently not on view
Object Name
abacus
date made
1968
maker
Naidorf, Robert
Physical Description
steel (overall material)
wood (overall material)
tape (overall material)
Measurements
overall: 15.8 cm x 26 cm x 7 cm; 6 7/32 in x 10 1/4 in x 2 3/4 in
ID Number
2005.0055.01
catalog number
2005.0055.01
accession number
2005.0055
subject
Learning Arithmetic
Arithmetic Teaching
Mathematics
Science & Mathematics
Abacus
See more items in
Medicine and Science: Mathematics
Learning Arithmetic
Arithmetic Teaching
Abacus
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Sherman L. and Marjorie A. Naidorf

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