If you ask the teacher who the gifted kids are , they are likely to point out the ones that are bright . Bright kids are a joy to teach. They listen well, don't question the teacher, work hard and answer questions. They don't challenge the teacher's competence or stray off the curriculum.
Bright kids enjoy school and get challenged with the work that they are asked to do.
They find the work neither too hard nor too easy. The gifted child on the other hand may be spending almost all of the school day thinking or doing something other than what the teacher wants. They find the constant repetition so boring that they often don't shine in the classroom. You might find the gifted child day dreaming, looking out of the window, reading a book instead of listening. Gifted children often hate school and are not challenged at all by the work presented to them and the concepts and ideas being taught are far below their intellectual prowess.