if its a full scholarship or nearly full scholarship to school, indicate it, anything short of it, i wouldnt mention how much it is unless it is something unique. even if it is a fulls cholarship, id just write full scholarship.
I feel the value places a sense of importance on the award. I didn't list my undergraduate scholarship as an EC, but I did list a chemistry award that carried a small cash scholarship, and I felt placing the value of the award shows that it isn't something 30% of the class receives each semester.
I think I included the scholarships I got in undergrad, using the schools names for the scholarship, i.e. President's Award, but didn't include the amount of the scholarship, rather the reason I got the award.
I wouldn't include the amount unless it is a full scholarship. Do put in a quick sentence about how one earns the scholarship. Is it merit-based, financial need, women only, engineering, non-trad? Did it require essays, interviews?