The abacus (plural abaci or abacuses), also called a counting frame, is a calculating tool which has been used since ancient times. It was used in the ancient Near East, Europe, China, and Russia, centuries before the adoption of the Hindu-Arabic numeral system. The exact origin of the abacus has not yet emerged. It consists of rows of movable beads, or similar objects, strung on a wire. They represent digits. One of the two numbers is set up, and the beads are manipulated to perform an operation such as addition, or even a square or cubic root. In their earliest designs, the rows of beads could be loose on a flat surface or sliding in grooves. Later the beads were made to slide on rods and built into a frame, allowing faster manipulation. Abacuses are still made, often as a bamboo frame with beads sliding on wires. In the ancient world, particularly before the introduction of positional notation, abacuses were a practical calculating tool. The abacus is still used to teach the fundamentals of mathematics to some children, for example, in Russia. Designs such as the Japanese soroban have been used for practical calculations of up to multi-digit numbers. Any particular abacus design supports multiple methods to perform calculations, including addition, subtraction, multiplication, division, and square and cube roots. Some of these methods work with non-natural numbers (numbers such as 1.5 and 3⁄4). Although calculators and computers are commonly used today instead of abacuses, abacuses remain in everyday use in some countries. Merchants, traders, and clerks in some parts of Eastern Europe, Russia, China, and Africa use abacuses. The abacus remains in common use as a scoring system in non-electronic table games. Others may use an abacus due to visual impairment that prevents the use of a calculator. (Wikipedia).

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From playlist Science Unplugged: General Relativity

We Love Opera! What is a recitative in an opera?

A quick definition of the opera term "recitative." It's a little break from the more complicated singing. Want to go to the opera, but you're not sure you'll understand what's going on? "We Love Opera" is a video series from Socratica that will help you understand what opera is all abo

From playlist Opera Glossary

A.I. Just Designed An Enzyme That Eats Plastic

» Podcast I Co-host: https://www.youtube.com/channel/UC6jKUaNXSnuW52CxexLcOJg » ColdFusion Discord: https://discord.gg/coldfusion » Twitter | @ColdFusion_TV » Instagram | coldfusiontv --- About ColdFusion --- ColdFusion is an Australian based online media company independently run by Dag

From playlist Technology

A review of the notes common to all formations of a G chord.

From playlist Music Lessons

We Love Opera! What is a prima donna?

A quick definition of the opera term "prima donna." It's not what you think! Want to go to the opera, but you're not sure you'll understand what's going on? "We Love Opera" is a video series from Socratica that will help you understand what opera is all about. Opera can be exciting, fu

From playlist Opera Glossary

Things Aren't Looking Great for the UK

There's been turmoil in the markets surrounding the UK pound. In this episode we take a look. --- About ColdFusion --- ColdFusion is an Australian based online media company independently run by Dagogo Altraide since 2009. Topics cover anything in science, technology, history and business

From playlist Business

The Gerbert abacus, designed by Gerbert d'Aurillac in the late 900s AD. It's a counting board with counters marked with arabic numerals. This is episode 43 of my series about antique calculating devices. Chris Staecker webarea: http://cstaecker.fairfield.edu/~cstaecker End song insp

From playlist Calculating Devices Review / HowTos

Sharp Elsi Mate model EL-429 Review / HowTo

The Sharp Elsimate calculator model EL-429, from 1978. It's an electronic calculator with attached soroban (abacus). This is episode 49 of my video series about calculating devices. End song inspired by "Hotter than a molotov" by The Coup. #soroban #calculator

From playlist Calculating Devices Review / HowTos

Star Trek: Picard (Math Props)

Math Props from Star Trek Picard S2E4 "The Watcher", first aired in March 2022. A russian abacus, somehow abandoned in pre-war France. Please comment if you know of any other math props in film or TV! Curta image CC-BY-SA-3.0 France by Wikimedia user Rama. #fascinating

From playlist Math Props

Japan's ancient secret to better cognitive memory - BBC REEL

The centuries-old abacus, once a common tool in many countries, has now been abandoned around the world. But in Japan, thousands of students are still taught proficiency on the abacus. Advocates argue that sliding the beads up and down with your fingers and then thinking with your brain c

From playlist Reel World

Calculator Sticks from the 1600s

Napier's bones, invented in the 1600s. They multiply a big number times a single digit. This is episode 8 of my video series about calculating devices. Chris Staecker webarea: http://cstaecker.fairfield.edu/~cstaecker Page about the bones: http://cstaecker.fairfield.edu/~cstaecker/bones

From playlist Calculating Devices Review / HowTos

Learn How To Use Abacus Functions - Without An Abacus! | Numbers | Maths | FuseSchool

Don't you have an abacus to order numbers? With the help of this video, you will be able to use the functions of an abacus without needing the abacus itself!

From playlist MATHS: Numbers

867 times 309 REVEALED fifteen ways

Finally, modern mathematics has allowed us to compute 867 times 309. 0:00 - Intro 0:27 - Hello Kitty Calculator 0:37 - Long multiplication 0:50 - Chinese abacus 1:20 - Burroughs Adding Machine (Class 3) 1:55 - Victor 10-key (700 Series) 2:19 - Slide rule (K&E) 2:39 - Lattice multiplicati

From playlist Calculating Devices Review / HowTos

Mathematical Visualization | The Power of Place Value | The Great Courses Free Lecture

The most powerful visual tool of mathematics was invented around the same time as paper. Of course, the most powerful visual tool of place value can be written ON paper—when your paycheck is for $200 instead of $2,000. Check your decimals (and your heartrate); this video covers both. Pres

From playlist Math and Statistics

Atrial Fibrillation (AFib) Explained

Atrial fibrillation (Afib) is a type of arrhythmia which is an abnormality in the pace or force of your heartbeat. This video explains Atrial Fibrillation. You can find specialists at CHI St. Vincent Heart Institute who treat atrial fibrillation (AFib) at chistvincent.com/afib

From playlist Healthcare Patient Education Animations

NUMBERS: "0", God's Gesture | Five numbers that changed the world | Cool Math

NUMBERS - secrets of Math. Mathematics is shrouded behind a veil and does not easily reveal itself. Students resort to rote memorization of math formulas to solve problems in a boring exercise of the mind that is also repetitive. However, if you knew the history of mathematics, the way the

From playlist Civilization

Learn How To Order Large Numbers Using Place Value | Numbers | Maths | FuseSchool

Learn how to order large numbers using place value! The virtual school is more than just a multimedia revision help. Teachers and students alike can access our content, connect and collaborate in our award-winning social learning environment and gain access to fascinating and exciting fun

From playlist MATHS: Numbers

stereolab - puncture in the radax permutation

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From playlist the absolute best of stereolab