If your kids get finished and never know what to do like mine do, try putting a Think Tank in your room! Designate an area of your classroom to the Think Tank by posting the directions and a different and challenging math question each week. I have mine at my math center and my competitive kids love it! I also entice my lower kids to try by offering a free homework pass to the one student selected as the winner!
This package includes a directions sheet, Think Tank answer slips, two sample problems, and a blank customizable sheet. This has worked wonders in my classroom and gotten them to think quite a bit more. I hope it does the same for you!