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<gallery>
<gallery>
File:Suanpan.png|suanpan (Chinese)
File:Suanpan.png|suanpan (Chinese)
File:Soroban.png|soropan (Japanese)
File:Soroban.png|soropan (Japanese)
File:Schety.png|schety (Russian)
File:Schety.png|schety (Russian)
File:Nepohualtzintzin.png|nepohualtzintzin (Mayan)
File:Nepohualtzintzin.png|nepohualtzintzin (Mayan)
</gallery>
</gallery>
'''Note:''' The display always assumes a fixed unit column, but you can override this choice.
'''Note:''' The display always assumes a fixed unit column, but you can override this choice.
<gallery>
File:Abacus-highlight.png|The beads moved most recently are highlighted.
</gallery>
=== Addition ===
=== Addition ===