Abacus Exercise
by Shantanu WadodkarDescription
this is Abacus exercise application,We use the abacus because it is an invaluable tool to help understand mental mathematics. Some people have difficulty grasping arithmetic because it is not something they can see or touch. By working with beads on the abacus, math becomes something one can understand quick.
https://en.wikipedia.org/wiki/Abacus
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