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Binary to Decimal
Convert Binary to Decimal utilizes a simple algorithm. For practice lets use 101101. 
First, space your binary number out: 
1    0     1     1     0     1
Next, starting from the right, assign values to each binary number. Start with 1 and multiply by two as you go to the right. 
    1      0      1    1     0     1
(32)    (16)    (8)    (4)    (2)    (1)
Now, you get to utilize the definition you learned for binary. For every binary number that is '0' change its value to 0 (meaning OFF). Then, simply add the values together. 
    1      0    1     1     0     1
(32) + (0) + (8) + (4) + (0) + (1) = 45 
Therefore, the Binary value of 101101 is equal to 45. 



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