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You write the whole number of money units, for example dollars, then a decimal point, and then typically two decimals for the fractional part, often called "cents". The number of decimals may vary for some countries. You also write the monetary symbol, such as $, the Euro symbol, etc., sometimes before, sometimes after, the number. Here, too, the details may vary by country.
The simplest form has the smallest numbers and so may be easier to manipulate.
1 mm = 1000 micrometre is written as a decimal. To write a number as a decimal only requires that the place value of each digit is ten times the place value of the digit to its right. The number may or may not have a decimal point, it may or may not have a fractional part.
Either 40000 or 40,000 may be used for the number "forty thousand."
As a fraction, 901/1000 can't be simplified,but it may be easier to write " 0.901 ".