In this lesson, you will learn the definition of an abacus. You will review the history of the abacus and learn about the oldest abacus known to man. You will also learn about different types, such as the Chinese, Japanese and Russian abacuses, as well as some modern-day uses of the abacus.

## What Is an Abacus?

The word abacus is derived from the Latin word *abax,* which means a flat surface, board or tablet. As such, an **abacus** is a calculating table or tablet.The abacus is the oldest device in history to be used for arithmetic purposes, such as counting.

It is typically an open wooden rectangular shape with wooden beads on vertical rods. Each bead can represent a different number. For simple arithmetic purposes, each bead can represent one number.

So, as a person moves beads from one side to the other, they would count, ‘one, two, three’, etc.An abacus can be used to calculate large numbers, as well. The columns of beads could represent different place values. For example, one column may represent numbers in the hundreds, while another column may represent numbers in the thousands.

## History of the Abacus

The written numbers (1,2,3,4, etc.) did not exist many, many years ago. But individuals still needed a way to count, especially merchants selling fruits, vegetables and other goods.

This is how the abacus came of use. It has been said that the first abacuses were just flat boards. Rocks would be placed on the board and moved about for calculation purposes. Other abacuses had a film of sand or dust on the top of the surface and one would use their finger to make calculations.Using rocks, seashells and fingers on the abacus could only be helpful to a certain extent. That is when the wooden beads became helpful.The oldest abacus known to man is the **Salamis Tablet**, named for the island of which it was found–Salamis Island in Greece–the nearest island to the capital of Athens.

It was found in 1846 and can be dated back to 300 BCE. The Roman hand abacus was the next abacus to be discovered. It was used in 300 CE in business, engineering and architecture. This is when the Romans were using Roman numerals. The abacus has come a long way since being used in ancient times by the Greeks and Romans.

## Chinese, Russian and Japanese Abacuses

One of the most popular kinds of abacuses is the Chinese abacus, also known as the **suanpan**.

Rules on how to use the suanpan have dated all the way back to the 13th century.On a Chinese abacus, the rod or column to the far right is in the ones place. The one to the left of that is in the tens place, then the hundreds, etc. So, the columns are different place values and the beads are used to represent different numbers within those place values. For addition, beads on the suanpan are moved up towards the beam in the middle. For subtraction, they are moved down towards the bottom or outer edge of the suanpan.

The rules of use are a bit more intricate and complicated, but this is the general idea of how one is used.The Japanese abacus is called a **soroban**. Like the suanpan, the soroban is divided into two levels.

The modern-day soroban has only one bead on the upper level and four beads on the lower level. For both the suanpan and the soroban, the top beads represent heaven, while the bottom beads represent Earth.Finally, the Russian abacus is called a **s’chyoty**. It has only one level and 10 beads on each row (much like two human hands have 10 fingers).

On each row, the four outer beads on each end, left and right, represent the fingers in one color and the two beads touching in the middle represent the thumbs in another color. Unlike the suanpan and the soroban, the s’chyoty is held with the wires running horizontally in rows, as opposed to vertically in columns.

## Modern Use of the Abacus

Due to its simplicity, some may wonder how and why an abacus would still be used for calculating. If you were given an abacus or a calculator, which would you use? Most would choose the calculator!But abacuses are actually used in high school classrooms in Japan. In fact, some Japanese students go to a special abacus school where they become experts in using the soroban.

There are even competitions and contests of Japanese students who will try to solve arithmetic problems with the use of the soroban compared to the modern-day calculator.Surprisingly, skilled users of the soroban sometimes win in speed competitions of solving arithmetic problems against those using a calculator. An ancient calculating tablet beating a calculator in speed of solving a problem? That’s pretty impressive, if you ask me!Many merchants in Asian and African countries still use abacuses to compute a customer’s total. Ed Byrne, a stand-up comic, was visiting a store in Hong Kong in 2013, and the store owner used a suanpan instead of a cash register.Abacuses are also used everywhere as a teaching method of basic arithmetic to young children.

In fact, many daycares and elementary schools have them in their assortment of ‘toys.’ Finally, abacuses are also used as a teaching tool for blind students to be able to perform calculations.

## Lesson Summary

An **abacus** is a board for arithmetic calculations.

The oldest known abacus is the **Salamis Tablet**, which dates back to 300 BCE. The Chinese abacus is called the **suanpan** and has two levels. The top level has two beads on each column and the bottom column has five beads on each column. The Japanese abacus, **the soroban**, is also two-leveled but it has one bead on the top level, four on the bottom. For both of these abaci, the top level represents heaven and the bottom level represents Earth.

The Russian abacus is called the **s’chyoty** with 10 beads on each row representing the number of fingers on two human hands.Modern-day uses of the abacus include soroban classes in Japanese high schools, clubs and competitions in Japan using the soroban, merchants in Asian countries using the abacus instead of a cash register to compute customers’ bills and a way to teach arithmetic to young children and blind students.