Question

what is a abacus and what is fu abacus

Answer 1

An abacus also known as a counting frame, is a calculating tool with beads that slide across on wires or rods.

Answer 2

the abacus also called a counting frame, is a calculating tool that was in use in europe, china and russia, centuries before the adoption of the written hindu-arabic numeral system.this exact origin of the abacus is still unknown.