use Math::Fraction;
$a = frac("10 3/4");
$b = frac("1/2");
$c = frac("2/5");
$d = $a * $b + $c;
print("$d\n");

##</code><code>##

+  -  /  *  +  +=  -=  *=  /=  ++  -- abs
<=> == != < <= > >=
** sqrt