If it is a wood shingle, two nails should be used - just in from the sides about 3/4" +/- and covered by the shingles to be nailed on above. Asphalt shingles usually take 4 or five nails placed above the tabs on the line that is marked (nailing patterns are always on the package and must be followed for the manufacturer's guarantee to be in effect).
Since three bundles are required to cover 100 sq feet. (based on three tab organic shingles) and each package holds 21 shingles, then the result is 63 shingles, four nails per shingle, or 252 nails. Add about 10% for items such as trim and you shouldn't be far wrong
A leaking roof can be a headache for many owners. In addition, a leaking roof can cause extensive water damage inside a home, potentially damaging the foundation. A shingle roof is simple to repair. Locate the damaged shingle on a rooftop, and pull back the shingles above it. Using a claw hammer, remove the nails holding in the damaged shingle. Check for any existing damage to the tar cover. If there is any damage, repair it with silicone or roofing tar. Place the new shingle under the existing roof shingles, and nail in place. Make sure no other shingles were dislodged.
There are or should be 300.
You don't shingle with pancakes.
Most asphalt shingles have a strict nailing schedule so the shingles are secure but don't leak. I have included a link to an illustration for an asphalt shingle nailing schedule below.
That's going to depend on the size of each shingle, and how far you overlap the adjacent courses.
Many DIY store should stock these.
There are or should be 170.
The weight of pea shingle can vary depending on factors such as moisture content and size of the stones. On average, a cubic meter of pea shingle can weigh between 1.4 to 1.6 tons.
21
The "nails" of an owl, if referring to fingernails like on a human, are called talons. Owls have four talons on each foot, totaling eight talons in all.
At least as many pancakes as it takes to shingle a barn.