Examples of Math methods in Saleforce

Hi Friends, This is my first Blog and i want to share u some examples of System.Math() in Salesforce. it will help in using math functions in ur running projects and by the way i am new to sales force.
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Example for Math.Round():-

     Decimal d = 12.12423432523;
     Decimal i=Math.Round(d); 
     system.debug('Result::::::::::'+i); 
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Example for rounding decimal Direct method:-

    Decimal d = 2.12345;

    d=d.setscale(3);

    system.debug('Result::::::::::'+d);
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Example of Math.abs():-

   Integer l = -42;

   Integer m=math.abs(l);

   system.debug('Result::::::::::'+m);
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Example of Math.ceil():-

   Integer WeekOfMonth = Math.ceil((Double)(system.today().Day()) / 7).intValue();

   system.debug('Result:::::::::'+ WeekOfMonth);
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Example for rounding decimal  & double Direct method:-

    Decimal d = 1.426 ;  

    Double num = d.setScale(2) ;
    System.debug('Result::::::::::::: ' + num) ;
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Example for using power in salesforce:-
   Decimal myDecimal = 4.12;
   Decimal powDec = myDecimal.pow(2);
   system.debug('Result::::::::::'+powDec);
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Example for using Math.max() :-
   Integer larger = math.max(12, 156);
   Decimal large = math.max(22.5,100.8);
   system.debug('Result::::'+Larger);
   system.debug('Results::::'+large);
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Example for using Math.min() :-
   Integer small = math.min(12, 156);
   Decimal smaller= math.min(22.5,100.8);
   system.debug('Result::::'+small);
   system.debug('Results::::'+smaller); 
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Example for using Math.mod() :-
  Integer Reminderval = math.mod(12, 2);
  system.debug('Result::::'+Reminderval );
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Example for using Precision() :-
Returns the total number of digits for the Decimal. For example, if the Decimal value was 123.45, precision returns 5.
 Decimal d1=1234.567;
 Integer precision1 = d1.precision();
 system.debug('Result::::'+precision1 );

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  For more methods in  maths please use the below link:-
@http://docs.database.com/dbcom/en-us/db_apex/apex_methods_system_decimal.htm@
@http://docs.database.com/dbcom/en-us/db_apex/apex_methods_system_math.htm@ 

   If u have any other examples please share with me Thanks&Regards Hecthick