Offer the most difficult first...
"Gifted students don't need to do 25 problems in math when they can do the five most difficult first to demonstrate mastery," says Brulles. She offers this opportunity to all students, not just those identified as gifted. Students who successfully complete the five problems are excused from that night's homework. If classwork is involved, the teacher simply needs to have a few extension activities on hand—tasks that carry the concept to the next level—for students to work on quietly while others complete the regular assignment.
"Most Difficult First" is one manageable way for teachers to compact the curriculum for their high-ability students. With compacting, students get to "throw away" the part of the curriculum that they already know, while receiving full credit for those competencies. This frees up students to work on more challenging content.
copied from ASCD