Learning Advantage 7989 F.U.N. Empty Number Line Card Set, Grade 6 to 8 F.U.N. Empty Number Line, also known as an "open number line", is a visual representation for sharing students' thinking strategies and developing number sense Great for math coaches and remedial teachers and others that teach across grade levels Set of 573 (including 30 blank write-on/wipe-off cards) with grade specific content aligned to the national and other major state standards Great for showing fraction equivalencies Buy the F.U.N. Empty Number Line System (sold separately) to have the hardware to hang the cards