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Using-an-Abacus-05.png (324 × 357 pixels, file size: 14 KB, MIME type: image/png)

Summary

Description
English: In (a) we use vertically arranged rods as counters of value one to represent the number 18. In (b) we use a horizontally arranged rod as a counter of value five and in (c) we use a more compact rod arrangement with alternation of orientation or not depending on whether we use a smooth table or a checkerboard (see details in Wikipedia).
Date
Source Own work
Author Jccsvq

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Captions

Counting rods, subitizing and bi-quinary coded numbers.

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14 September 2021

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current05:12, 14 September 2021Thumbnail for version as of 05:12, 14 September 2021324 × 357 (14 KB)JccsvqUploaded own work with UploadWizard

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