8 * 2 = 16
16 * 2 = 32
( 8 + 8 ) * 2 = 8 * 2 + 8 * 2 = 16 + 16 = 32
32 * 2 = 64
( 16 + 8 ) * 2 = 16 * 2 + 8 * 2 = 32 + 16 = 64
16 : 2 = 8
32 : 2 = ( 16 + 16 ) : 2 = 16 : 2 + 16 : 2 = 8 + 8 = 16
64 : 2 = ( 48 + 16 ) : 2 = 48 : 2 + 16 : 2 = 24 + 8 = 32