The abacus is a simple frame comprised of rods on which beads are moved to represent various groups of numbers. For centuries the abacus was a cutting edge device used by the Chinese, Greeks, and Romans.

Pascaline

A later adding machine, called the comptometer, did not require that a crank be pulled to add. Some adding machines were electromechanical — an old-style mechanism, but driven by electric power. Some “ten-key” machines had input of numbers as on a modern calculator – 30.72 was input as 3 , 0 , 7 , 2 .

A selection of Mechanical calculators: These include the Pascaline invented by Blaise Pascal, and the Stepped Reckoner invented by Leibniz, both in the 17th century, and Charles Xavier Thomas’s Arithmometer in the 19th century.

An abacus is considered one of the first calculating devices invented by man. It is a manual device which takes time and a great deal of experience to master. The first mechanical calculating machine was invented in 1642 by Blaise Pascal, a 19-year-old Frenchman. Pascal’s machine used gears and could add and subtract.

Most vintage pockets electronic calculators are a dime a dozen, with few exceptions (an original 1975 HP-25 programmable calculator in great condition might be worth about $100 or so).

Alternative Ways to Recycle As long as your calculator still works, you can sell it to sellyourcalculators.com or cash4calcs.com. Not only do you get cash, but your calculator gets reused and you keep one more piece of e-waste out of the landfill.

Sell Your Calculators for Cash Online Sell your new, used, or broken graphing calculators for cash at BuyBackWorld.com. You can use our graphing calculator trade-in program to quickly and easily sell your device for cash.

A Brief History: The Busicom LE-120A, known as the HANDY, is the first handheld calculator to use a “calculator on a chip” integrated circuit. According to the Vintage Calculators Web Museum, the calculator featured a 12-digit display in red LED and cost $395 when it first went on sale in January 1971.

In the early 1970s, calculators could cost several hundred dollars, but by the end of the decade, the price had come down to make them much more affordable and much more commonplace.

By 1977, a liquid crystal display calculator known as the Teal LC811 sold regularly for $24.95, with a sale price of $19.95.

Most calculators rely on integrated circuits more commonly known as chips. Integrated circuits contain transistors that can be turned on and off with electricity to perform mathematical calculations. The most basic calculations are addition, subtraction, multiplication, and division.

Yes, pretty much every calculator is wrong since it operates on the finite precision representation of numbers so you cannot avoid rounding and a truncation.

The reason calculators are so fast is that they have no moving parts. The invention of transistors, integrated circuitry and years of refining have led to the modern-day pocket calculators. The earlier vacuum tube calculators would take days what today’s calculators can achieve in seconds.

The Secret Calculator App looks like an innocent calculator app on your child’s Iphone or Android device. Actually, this app is used to hide files, photos and videos. This app is popular because it helps anyone to hide images, sexting photos, and files in a folder that can never be found.

(These are the famous 1s and 0sthat form the binary language of computers and calculators.) All numbers can be represented by a series of 1s and 0s. Now the calculator must add those inputs together. Calculators (and computers) combine inputs using electronic components called logic gates.

Calculators, computers, and a growing array of technological innovations are important tools for doing mathematics, joining the ranks of the compass, straightedge, pencil, slide rule, and trig tables.

It is simply a tool. They said the real effects of technology depend upon how it is wielded. It can be used to inspire and catalyze change just as easily as it can be used in ways that are detrimental to society.

An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics. The first solid-state electronic calculator was created in the early 1960s.