How can I add only the highest four digits from the array of five items in Javascript ?

Question

Numbers = [7,4,9,2,0];

Answer 1

https://code.sololearn.com/WsIgac2B7tgv/?ref=app

Answer 2

How ?

Answer 3

https://code.sololearn.com/Wi0EGu7o01no/?ref=app

Answer 4

Try deleting the lowest digit instead.