The former people try to use many different ways to record Numbers.
In order to write the greater number of and more complex calculation,Arabic Numbers have been invented,but it was originally Indian invention,they developed system of Numbers 1 to 9,this great invention for human future life provides great convenience.
But only artificial calculation is cannot satisfy the demands of the people,hence,the computing machines began to appear.Initial computational tool is abacus,people but use it more quickly and more accurate calculation,but along with the increase of amount of calculation,people invented more modern computer,it's in a very short time calculation more questions,function more powerful.
We believe,in the near future,calculator will become more and more humanized function more and more powerful.