Abacus

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noun----
==Entry==
Definition and Meaning:	Abacus is a counting device. It can be used for arithmetic operations such as addition, subtraction, multiplication and more.
 	
Example : 	
 7 can be formed by using one bead on the top row,
 and 2 beads from the bottom row, because 5+2 = 7
Category:Math dictionary
Category:Basic Math
Category:A