Kertolaskun Säännöt

                       
   
0
      
0
      
1
      
1
 
x 0
    
x 1
    
x 0
    
x 1
          
   
0
      
0
      
0
      
1
	 
  Esim.
	
    10            
ab
       
  
x 11
          
x cd
           
    10         
ad bd
     (a AND d) (b AND d)
 
+ 10 
    
+ ac bc   
     (a AND c) (b AND c)  
   110	

	 Lataa 2 bitin kertolasku -appletti 
	 

Desimaalilukujen kertolasku

     123
   x 456
   =====
     738  (this is 123 x 6)
    615   (this is 123 x 5, shifted one position to the left)
 + 492    (this is 123 x 4, shifted two positions to the left)
   =====
   56088

Binäärilukujen kertolasku samalla tavalla

       1011   (this is 11 in decimal)
     x 1110   (this is 14 in decimal)
     ======
       0000   (this is 1011 x 0)
      1011    (this is 1011 x 1, shifted one position to the left)
     1011     (this is 1011 x 1, shifted two positions to the left)
  + 1011      (this is 1011 x 1, shifted three positions to the left)
  =========
   10011010   (this is 154 in decimal)

  Lataa 4 bitin kertolasku -appletti 
 
  Lataa "Kerto moduuli" -appletti