Usually your elbow/arm or your finger bone.
people break thier femur bone because they fall on it.
The most common bone you break while skateboarding is your arm. Usually, people fail a trick and are thrown from their boards. Second to your arm, is your wrist.
the malingerer bone
clavicle is most commonly fractured. but in old females femur usually fractured at neck level.
The collar bone
The most dangerous bone to break is the skull.
Often when you break a bone, you don't feel it for awhile as you are in shock.
Most likely... If you have a parachute then you might not break a bone. Without one u'll probably die and break a bone. There is a chance that the parachute is not working so there isn't a 100% chance of you not breaking a bone <><><> From 300 feet. you will break MOST of your bones. 99.99999% fatal.
your wrist
The Zygomatic Arch
most likely the pelvis because it is a very hard bone but skull is the hardest
Often when you break a bone, you don't feel it for awhile as you are in shock.