ABACUS:
It is believed that abacus was invented by Chinese or Egyptian about 500 years ago. Chinese called it 'suan pan' which means counting device.
Abacus consists of a frame mounted with rods along which beads or balls which are moved for calculation.
Abacus is used for making calculations like to find sums and differences.
Its features are as follows:
a) This can in turn help to solve equations involving counting numbers.
b) Abacus is a portable device.
c) It is built out of wood & beads.
source:wikipedia.org
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