After sharing:

=( 128+64+32+ 16+8+4+2+ 1)/256

=255/256

1/2+ 1/4=3/4

1/2+ 1/4+ 1/8=7/8

1/2+ 1/4+ 1/8+ 1/ 16= 15/ 16

........... follows this rule.

1/2+ 1/4+ 1/8+ 1/ 16+ 1/32+ 1/64/+ 1/ 128+ 1/256=255/256