How many World War I German dreadnoughts would be a significant threat to a World War II King George V?
Short answerNo number is given. Their shells remain dangerous if they can close to an effective range.
NotesFirst World War heavy shells would still be dangerous to a Second World War King George V if the German ships closed to an effective range. Newer design and equipment would not make the battleship immune to their fire. The answer therefore makes distance the decisive condition. It does not give a count of German dreadnoughts that would guarantee a serious threat.