You can use an abacus to count, add, subtract, multiply and more. Try this interactive abacus and see if you can make the numbers. Choose "here's more" for some clues. Good luck!

This site contains a Wikipedia description of an abacus.

This resource has three problem sets to practice subtraction using Abacus worksheet. Select a problem set, then select a question. Fill in the blank with the correct answer for each problem. When you have answered all of the questions,...

The Computer History Museum located in Mountain View, California, provides a glimpse into the development of the information age via their large collection of artifacts. This section highlights the development and use of the abacus, "a...

[Free Registration/Login Required] Use the move tool to slide the beads on the abacus back and forth to explain the concept of counting.

Create edible patterns and countable designs using waffles and berries. Fun idea for young learners.

A photo of an abacus. Also known as a counting frame, the abacus has been an important tool for making calculations for thousands of years, and is still used in many places today. This particular example is a Russian abacus.

abacus

abacus

Learn how the abacus can be used to do simple arithmetic operations.

The abacus is an ancient calculating tool. This lecture series presents a brief description of the abacus and its use.

This companion website for acclaimed PBS series "Triumph of the Nerds" explores the history of the computer, tracing the progression of computing technologies from the abacus to the World Wide Web.

This lesson provides activities to demonstrate how "A pebble calculator works in a way similar to an abacus," which will allow learners to increase their understanding of how computers work. The lesson also provides discussion prompts...

[Free Registration/Login Required] A directory of history resources (games, activities, puzzles, graphics) to be used as part of elementary study of Ancient Egypt and Greece, the Middle Ages, the Revolutionary War, and other topics....

The headrest of Mesehti is carefully modeled. It has a curved top with a square abacus, or slab, above a short shaft and a base. Open hands were drawn in brown as a reference to the magical function of the headrest.

This site presents a pictorial timeline of technology developments.

Use the diagram on this one page website to solve the problem. There are teacher notes and the solution is only a click away.

An image of George Inness.