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# Who invented the adding machine?

**The adding machine was invented by French mathematician, physicist and philosopher Blaise Pascal.** Pascal developed his mechanical device, which he named the Pascaline, in 1642. The apparatus, whose predecessor was the abacus, is regarded as the original digital calculator in that it operated by counting integers.

In 1671, the German mathematician and philosopher Gottfried Wilhem von Leibniz expanded on its design, resulting in the Step Reckoner, a calculating machine first built in 1673. The Step Reckoner could multiply as well as add by using repeated addition and shifting.

The first modern computer, the Analytical Engine, was not conceived until several years later in 1834 by English mathematician and mechanical engineer Charles Babbage.

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## What did Galileo do?

A: Galileo Galilei was a famous Italian astronomer, engineer, physicist, philosopher and mathematician who lived between 1564 and 1642. He advocated many adva... Full Answer >Filed Under: -
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## When was the X-ray machine invented?

A: The x-ray machine was invented in November of 1895 by German physicist Wilhelm Rontgen. X-rays are used extensively for medical imaging of bones, teeth and... Full Answer >Filed Under: -
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## What is the formula to convert lbs to kg?

A: The formula to convert kilograms to pounds is pound = kilogram/0.45359237. Conversely, the formula is kilogram = pound x 0.45359237. One kilogram is equal ... Full Answer >Filed Under: -
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## What is the best way to practice third-grade math online?

A: Students can practice third-grade math online at free education sites such as Khan Academy, Adapted Mind, Math ABC and IXL. All of these sites break down m... Full Answer >Filed Under: