This website provides questions to test your mental arithmetic skills, so do NOT use pen and paper or a calculator. According to this Wikipedia article "Mental calculation is said to improve mental capability, increases speed of response, memory power, and concentration power." Performing mental calculations is an excellent way to train your brain. It generates an endless supply of arithmetic problems, based on random numbers. ![]() 'Arithmetic Problems' is a web application that's optimized for iPhone, but it also works on normal computers. For more hints take a look at the article on mental calculation in Wikipedia Learn the different methods of subdividing the problems by following the hints at the right side. You can easily improve your skills in mental arithmetics! You don't need to be a genius, its just some training on this website. ![]() All worksheets are provided as PDF documents for easy printing. Worksheets currently include addition, subtraction, number bonds, times tables, number sorting, and much more. This is a website offering a vast selection of FREE printable mathematics worksheets for children aged from 4-11 years. In this article we look at a few mathematicians who have shown extraordinary powers of memory and calculating. This web page provides information about all the mathematicians who exhibited extraordinary mental powers. We seek to retell the story of our beginnings.T est Your Mental Arithmetic Capabilities The first reported and substantiated use of an abacus, or abacus-like instrument was in Sumeria between 2,700 and 2,300 BCE - or roughly 4,700 years ago.This used a table of columns with each column equivalent to an order of magnitude above the previous column just as we would have columns for x10, x100, x1000, x10000.During the next 2000 years various forms of this came into common usage. Photo: Ben Marans/SOPA Images/Getty Images. Our open community is dedicated to digging into the origins of our species on planet earth, and question wherever the discoveries might take us. (3 min) Blank sheets of paper have become an antigovernment protest symbol in China. We’re the only Pop Archaeology site combining scientific research with out-of-the-box perspectives.īy bringing together top experts and authors, this archaeology website explores lost civilizations, examines sacred writings, tours ancient places, investigates ancient discoveries and questions mysterious happenings. The goal of Ancient Origins is to highlight recent archaeological discoveries, peer-reviewed academic research and evidence, as well as offering alternative viewpoints and explanations of science, archaeology, mythology, religion and history around the globe. And while some people may seem content with the story as it stands, our view is that there exist countless mysteries, scientific anomalies and surprising artifacts that have yet to be discovered and explained. The earliest known written documentation of the Chinese abacus dates to the 2nd century BC.Īt Ancient Origins, we believe that one of the most important fields of knowledge we can pursue as human beings is our beginnings. The beads are moved up and down during calculations.Īccording to legend, the Chinese abacus (‘suan pan’ or ‘zhusuan’) was invented by mythical Yellow Emperor (Huangdi), father of Chinese civilization. There are five beads on each rod on the bottom deck, known as earth. The upper deck, which is known as heaven, has two beads on each rod. The typical abacus has a hardwood frame and hardwood beads, with two decks and more than seven rods. ![]() Now this ‘ancient computer’ has received credit for its historical and cultural importance by being added to the world intangible cultural heritage list. Some devices can be quite large and complex. It can be used for high-speed addition, subtraction, multiplication, division, square roots, cube roots and other calculations. The abacus, also called a counting frame, is a calculating tool that was in use centuries before the adoption of the written modern numeral system and is still widely used by merchants, traders and clerks in Asia, Africa, and elsewhere.
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