This site offers many math games on vectors that allow you to practice vector calculation: coordinates of a vector, norm of a vector, coordinates of the middle of a segment.
Online math games : vector | quiz | algebraic calculation | 10th Grade | sophmore year | year 11 | 11th Grade | junior year | year 12 | 12th Grade | senior year | year 13 | 15 year old | 16 year old | 17 year old | Middle School | High School | junior | games and quizzes corrected