Changes

From left to right:

From left to right:

:project-toolbar button

* project-toolbar button

:saupan button (Chinese abacus)

* saupan button (Chinese abacus)

:soroban button (Japanese abacus)

* soroban button (Japanese abacus)

:schety button (Russian abacus)

* schety button (Russian abacus)

:nepohualtzintzin button (Mayan abacus)

* nepohualtzintzin button (Mayan abacus)

:binary button (binary abacus)

* binary button (binary abacus)

:hexadecimal button (hexadecimal abacus)

* hexadecimal button (hexadecimal abacus)

:fraction button (fraction abacus)

* fraction button (fraction abacus)

:customization-toolbar button

* customization-toolbar button

:stop button not shown

* stop button not shown

[[Image:Abacus-custom-toolbar.png|left]]

[[Image:Abacus-custom-toolbar.png|left]]

From left to right:

From left to right:

:select the number of rods

* select the number of rods

:select the number of beads on the top of the frame

* select the number of beads on the top of the frame

:select the number of beads on the bottom of the frame

* select the number of beads on the bottom of the frame

:select the multiplication factor of top beads (e.g., on the Chinese abacus, each top bead counts as 5× the value of a bottom bead on the same rod)

* select the multiplication factor of top beads (e.g., on the Chinese abacus, each top bead counts as 5× the value of a bottom bead on the same rod)

:select the base to determine the value of bottom beads across rods; this is 10 on most conventional abacuses, but 20 on the Mayan abacus, 16 on the hexadecimal abacus, and 2 on the binary abacus.

* select the base to determine the value of bottom beads across rods; this is 10 on most conventional abacuses, but 20 on the Mayan abacus, 16 on the hexadecimal abacus, and 2 on the binary abacus.

== How to use an abacus ==

== How to use an abacus ==