Does anybody else have this book by Abacus Software? I think I need help on page 12 or is this just a typo on their part? The part where they add two binary numbers and then get the answer on parenthesis, they have 6 + 11 =17. Should it not be 16 + 1? The end result is 17. Also on the multiplication part I understand how they get 1000010 when they multiply 0100 * 1011 but again the parenthesis throws me off. They have 6 * 11 = 66. I thought you still had to just add the end result. I get 64 + 2 = 66. The end result is still 66. Is there something I am not doing right here to verify the end result?