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Basic abacus
Japanese abacus
Chinese abacus
Chinese abacus
15246 − 530
The abacus javascript code is based on the
source code
of
Thorsten Thormaehlen
eMathtimes
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Getting started
exercises
Addition
one figure
more figures
Substraction
one figure
more figures
Multiplication
one figure
more figures
Division
one figure
more figures
