My DD is in second grade. An accelerated gifted program is available, but does not start until third grade.

In the meantime, she is clustered with other gifted kids in her regular second grade classroom and goes to an enrichment class one day a week. Her teacher has attempted to challenge the gifted kids with somewhat harder and more challenging applications of the second-grade math. She also gets challenging math puzzles in her enrichment class.

This is suitable for DD for now, but not enough to satisfy her very "mathy" gifted classmate. So in January the teacher started sending him to a third grade classroom for math time. This week, she started sending him to a FOURTH grade classroom for math time. (Guess he mastered third grade math in two months.)

It seems to me that math-time only acceleration might be a workable solution in lots of cases where there is not a desire to accelerate a student across the board, for whatever reason.