## Solvers

Published January 14, 2017

Solvers-virtuoso in many cases facilitate the work itself by resorting to simple algebraic transformations. For example, the calculation of 988² performed as follows...

## Rounding of numbers

Published January 14, 2017

Rounding of numbers used to work with numbers within the number of characters that correspond to the actual parameters of the calculation accuracy. In the past, rounding of intermediate values and the result had applied value (in the calculations on paper or using primitive devices such as the abacus accounting extra decimals can seriously increase the amount of work)...

## The mass of the atmosphere

Published January 14, 2017

What is the mass of the Earth's atmosphere? On each square centimeter of the Earth's surface air presses with a force about a kilogram. The Earth's atmosphere is made of such air columns. So, how many square centimeters comprises a surface of our planet, this is the mass of the atmosphere. It is known that the earth's surface is equal to 510 million sq. km...

## Happy numbers

Published January 14, 2017

One day I was watching an interesting TV show. It said that in life play an important role happy numbers that are associated with the results of some arithmetic operations. For example, if you add up the numbers corresponding to the date of birth, and the number of letters in the name of the person, then the sum will give the first happy numbers...

## The number 12

Published January 14, 2017

Why is the number 12 remarkable? This is the number of months in a year the number of units in a dozen. But what is special in the number 12? Few realize that the number 12 - the old and nearly winning the number 10 contender in the fight for the honorary post of radix. The civilized peoples of the ancient East – the babylonians and their predecessors who inhabit Mesopotamia, scored in duodecimal...

## The abacus

Published January 14, 2017

The abacus has long been out of fashion, it was replaced by calculators and computers. But the history of this counting machine should be told. Few people know what we do, sometimes tying "memory" knot in a handkerchief. With a great sense of our ancestors, "recorded", thus, the result of the account on the laces...

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