The numbers indicate the relative hardness of the pencil lead.
The possessive form for the plural noun pencils is pencils'.Example: My pencils' lengths are all more than 6 inches.
18 of them
It all depends on how you use it in a sentence.
Colored pencils were created around 1920 by A.W Faber Company, located in Germany. Don't we all just love colored pencils? :D
Pencils come from all-around such as the United Kingdom, China, Japan, and other Countries.
Yes.
All physical items exerts a gravitational force on all other items. But for pencils it's real small and weak, and can usually be ignored.
Pencils are graded H (Hard) or B (Black). Hard pencils are best for fine lines (such as a draughtman might use), Black pencils are better for most types of drawing (and for shading in). An all purpose pencil is HB (just in the middle), but you can usually find H, 2H, 3H, 4H, B, 2B, 3B, 4B - and sometimes even higher numbers.
1. They come in many different colors. 2. They are not all gray.
It depends on the size and type of tree, but generally, you can make about 170,000 pencils from one tree.
No it is not. One of the two numbers must be 1. So 1.33... per pencil or 0.75 pencils for 1 would be unit rates.