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==Scientific notation==
==Scientific notation==
Logarithms provide the basis for the [[scientific notation]], it is used to write large numbers down without all of the zero's, when using scientific notation all numbers are rounded to two decimals by convention.
Logarithms provide the basis for the [[scientific notation]], which is used to write large numbers down without all of the zero's, when using scientific notation all numbers are rounded to two decimals by convention.
For example: 3127000 = <B><math>3.12*10^6</math></B> or <B><math>3.12E6</math></B>
For example: 3127000 = <B><math>3.12*10^6</math></B> or <B><math>3.12E6</math></B>
In economics powers of ten are important because they make the division of a currency into smaller units easier because multiplication by ten can be achieved by adding a zero.
In economics powers of ten are important because they make the division of a currency into smaller units easier because multiplication by ten can be achieved by adding a zero.
Until 1971 there were 20 shillings in an [[English Pound]] <B>(£)</B> and 12 [[pence]] in a [[shilling]] <ref>[http://62.65.69.4/archives/files/fileinfo/140/14044.html]</ref>. This made calculations difficult, that's why the Pound was decimalized in 1971.
Until 1971 there were 20 shillings in an [[English Pound]] (<B>£</B>) and 12 [[pence]] in a [[shilling]] <ref>[http://62.65.69.4/archives/files/fileinfo/140/14044.html]</ref>. This made calculations difficult, that's why the Pound was decimalized in 1971.
Today an English Pound is worth 100 pennies.
Today an English Pound is worth 100 pennies.
==Decimalization of time==
==Decimalization of time==
The ancient [[Egypt]] equivalent of a week was a ten-day period, or "decade" <ref>[http://www.touregypt.net/magazine/mag03012001/magf1.htm]</ref>.
The ancient [[Egypt]] equivalent of a week was a ten-day period: a "decade" <ref>[http://www.touregypt.net/magazine/mag03012001/magf1.htm]</ref>.
Egyptians worked for eight days, the remaining days were free days.
Egyptians worked for eight days, the remaining days were free days.