Why am I so easily amused?

Examples of a hash

     15 => 1+5=6 \x
   x 11 => 1+1=2 ==> 2x6=12 => 1+2=3
   ----
    165 => 1+6+5=12 => 1+2=3

     44 => 4+4=8           \x
   x 66 => 6+6=12 => 1+2=3 ==> 3x8=24 => 2+4=6
   ----
   2904 => 2+9+0+4=15 => 1+5=6

     42 => 4+2=6 \+
   + 23 => 2+3=5 ==> 5+6=11 => 1+1=2
   ----
     65 => 6+5=11 => 1+1=2

     57 => 5+7=12 => 1+2=3 \+
   + 94 => 9+4=13 => 1+3=4 ==> 4+3=7
   ----
    151 => 1+5+1=7

    4.5 => 4+5=9    \x
 x 12.7 => 1+2+7=10 ==> 10x9=90 ==> 9+0=9
 ------
  57.15 => 5+7+1+5=18 => 1+8=9

     92 => 9+2=11 => 1+1=2 \-
  - 115 => 1+1+5=7         ==> 7-2=5
  -----
     23 => 2+3=5

     92 => 9+2=11 => 1+1=2 \/
  / 115 => 1+1+5=7         ==> 7/2=3.5 => 3+5=8
  -----
    0.8 => 0+8=8