Abacus History and Use

<Tab/><Tab/>The abacus, often called the earliest calculating machine in the world, has a long history. The earliest mention of the abacus can be dated back to the Eastern Han Dynasty, where it was mentioned in a book by Xu Yue in about 190 A.D, There was a time when numbers were not written. As larger numbers become needed past the amount on a human hand, various natural goods become items in the counting process.
<Tab/>The history and evolution of the abacus is a long one and is often divided into three time periods including Ancient Times, Midd…