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File:Abacus-617283945.png|The result is 61728394.5.
File:Abacus-617283945.png|The result is 61728394.5.
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'''TODO:''' Add instructions for long division.
'''TODO:''' Add instructions for long division.
=== Fractions ===
The fraction abacus lets you add and subtract common fractions: 1/2, 1/3, 1/4, 1/5, 1/6, 1/8, 1/9, 1/10, and 1/12, The fractional value is determined by the number of black beads on a rod, e.g., to work with thirds, use the rod with three beads, to work with fifths, use the rod with five beads.
The rods with white beads are whole numbers in base 10; from left to right 100000, 10000, 1000, 100, 10, and 1.
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File:Abacus-fractions.png|1/2 + 1/3 + 2/12 = 1
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==Discussion==
==Discussion==