How can you access to a hash value, add and delete a key/value pair and modify a hash?

my %numbers = (
  'First' => '1',
  'Second' => '2',
  'Third' => '3'
);

• Access:

print($numbers{'First'});

• Add:

$numbers{'Fourth'} = 4;

• Delete:

delete $numbers{'Third'};

• Modify:

$numbers{'Fifth'} = 6;
$numbers{'Fifth'} = 5;