You could do something like this:

%hash1 = qw( 
	2 cars
	1 motorcycle
	4 balloons
	);

%hash2 = qw(
	5 airplanes
	3 helicopters
	6 skateboards
	);

%hash3 = ( %hash1, %hash2 );

for (sort keys %hash3) {
	print "$_ => $hash3{$_}\n";
}