title: How to read Hexadecimal correctly
body: <p>My book says 0010 1010 in binary notation equals to 42. Then if you use hexadecimal you can break that down into 2A. My book says </p>
  
  <blockquote>
    <p>2 = (2 * 16 = 32) A = (10 x 1 = 10) so 32 + 10 = 42</p>
  </blockquote>
  
  <p>I'm totally lost. I don't understand, if you're starting from the right to left, why the values of the first four digits are  2 + 8 = 10 = A. Why is then 32 equal 2 and not 32. Aren't you counting the totals? </p>
  
  <p>And why are you multiplying 10 by 1 and then 2 by a different value of 16?  </p>