You should price these by braid length, rather than the number of rows because younger kids are squirmy and tend to take just as much time.  If you are fortunate to have one young enough who only needs six rows, but sits still and is done quickly, you can offer them some free candy or a dollar discount for being good.  This will encourage others.

An average half style should cost between $7 to $15 depending on the market and length of hair.  If they only want rows to the middle part, and the rest loose, or if they have relatively short hair, you should charge them the minimum.  If they have long hair and want the braids to go to the ends of the hair, charge the maximum.
 
 

Initial Parting	It helps with the speed and neatness to begin by parting the hair into three sections.  A half style should basically go from ear to ear. Secure the sections you're not working with, with a hair clip or rubber band.
Straight and Simple	The most basic half style is of course straight cornrows, from the front to the middle of the head.  You can do these in either or alternating directions. For a young child, you may only need 6 rows, and for a somewhat older one, 8.  Most teens and adults require 10 rows.
Sunrays	This one doesn't take any more time than the front to middle ones, but it's a little prettier on some shapes of head.  People with long, thin faces look better in this than with straight rows.
Pony Tail	With this style, you're doing rows from the hairline to the crown of the head.  Many moms love this style for school.  Kids like it too because it keeps their hair out of their face, and they can use all kinds of cute clips and scrunchies to dress it up their own way.
Half Rainbow	In this style you're starting rows from the center line, following the shape of the person's hairline to the base part.  At the sides, you just do a couple of rows from front to middle.
Corners	This style uses angles.  You can start the rows from the baseline to the sides or from the sides to the baseline.
Triangle/Chevron	Some folks who have round faces may like the Sunray, but it doesn't look as good on them as the Chevron.  Try to encourage them to pick this one.
Half Lap	This one is similar to Straight and Simple, but it looks better on people who don't want so much show on the sides.  It's sort of a compromise between S&S and the Ponytail.
Half Honey	Some of you from the beginners' course may remember the honey pattern.  Well, in this one, you'll make two tiers of somewhat wide rows.  Some people prefer "chunkier" rows, and this is a way you can give them that without it coming out looking amateurish.
Half Cowrie	This style looks a little more complicated, but it doesn't take more than 5 or so more minutes than the others.  The extra time is spent on making 2 or 3 small rows going from the center outwards, at the middle of the shell shape.  Then gather this hair into the curved row on the outer part of the shell.
Half Zag	Here's another pattern from the beginning class.  When you're doing it on a half head, part so that the braids are going from the zag outwards, rather than towards the back of the head.