how a players numbers correspond to the position he plays?

Question

im just curious i never really thought about it.. ie why is a Qb's/ kicker/ punter , number low 7-14 and defence and offence are higher?

Answer 1

Mostly goes like this
1-19 QB's and special teams. (Sometimes receivers)
20 - 49 RB and DB's
50 - 60 linebackers.
60 - 79 Offensive linemen.
80 - 89 receivers and tight ends.
90 - 99 Defensive linemen.
There are exceptions thou.

Answer 2

"Below is the numbering system established by the NFL, and in place since 1973:

Numbers 1 to 19 are worn by quarterbacks, kickers, and punters.

Since 2004, Wide receivers are also allowed to wear numbers between 10 and 19 if they so choose, even if there's an 80-89 number available.

Numbers 20 to 49 are worn by running backs, tight ends (when an 80-89 number is unavailable), cornerbacks and safeties.

Numbers 50 to 59 are worn by linebackers and offensive linemen.

Numbers 60 to 79 are worn by members of both the offensive line (the tackles, guards and centers) and defensive line (the defensive ends, defensive tackles and nose guard).

Numbers 80 to 89 are worn by wide receivers and tight ends.

Numbers 90 to 99 are worn by linebackers and defensive linemen.

Numbers 0 and 00 are no longer used, though they were issued in the NFL before the number standardization in 1973. George Plimpton famously wore 0 during a brief stint at quarterback for the Detroit Lions. Jim Otto wore number "00" ("aught-oh") during most of his career with the Oakland Raiders. Wide receiver Ken Burrough of the Houston Oilers also wore "00" during his NFL career in the 1970s.
It should be noted that this NFL numbering system is based on a player's primary position. Any player wearing any number may play at any position on the field at any time (though players wearing numbers 50-79 must let the referee know that they are playing out of position by reporting as an "ineligible number in an eligible position"). It is not uncommon for running backs to line up at wide receiver on certain plays, or to have a large lineman play at fullback or tight end in short yardage situations. Also, in preseason games, when teams have expanded rosters, players may wear numbers that are outside of the above rules. When the final 53-player roster is established, they are reissued numbers within the above guidelines."

- straight from Wikipedia