Why does Death the kid like the number 8 еще then 0?

Because the number 8 is еще detailed than the number 0 which is just an oval and Ты can divide the number 8 evenly.

because Ты can cut 8 esacly in half and it will stay even

even zero can divide by its picture it can be symmetrical but if is divide be its number it can not divide anymore

Easy question, if Ты ask me. Have Ты seen him in his Insanity-mode (during the manga)?
I don't think he would want something like that ever again; and the number 0 represents "nothingness", doesn't it?

Some people don't consider zero and actual number, just a placeholder