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insider.si.edu
3 个月
The Abacus and the Numeral Frame Early Use of the Numeral Frame
Various forms of the abacus have been and still are used in arithmetic teaching. From the late 1830s, many American schools purchased numeral frames. These demonstration devices had one or more wires ...
HowStuffWorks on MSN
3 个月
VII, MCM, XL: Roman Numerals Made Understandable
The Roman numeral system is an ancient method of writing numbers ... It was developed during the early days of ancient Rome.
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