= 0.714285714285714285714285… repeats every 6 digits. 37/40 = 0.925000000… settles down, and then repeats every 1 digit. 2/3 = 0.6666666… repeats every 1 digit. In binary you’d write “2/3″ as “10/11″ and its binary representation is 10/11 = 0.10101010101…., which repeats every 2 (still less than 3, isn’t that strange?). Using