Question 773133
(-3 5/8) + 4 2/5
<pre>
{{{-3&5/8}}}{{{""+""}}}{{{4&2/5}}}

They have different signs so we subtract them and take the sign
of the one which has the largest absolute value:

  {{{4&2/5}}}{{{""=""}}} {{{4&16/40}}}{{{""=""}}} {{{3&56/40}}}
 {{{-3&5/8}}}{{{""=""}}}{{{-3&25/40}}}{{{""=""}}}{{{-3&25/40}}}
-----------------
              {{{31/40}}}                      

Edwin</pre>