Rich & engaging mathematical tasks : grade 5-9 - Lappan, Glenda; Smith, Margaret S.; Jones, Elizabeth (Reston, Va. : National Council of Teachers of Mathematics, 2012)
"Articles and activities from Teaching children mathematics; Mathematics teaching in the middle school; Mathematics teacher; Student math notes; the 2001, 2002, and NCTM yearbooks"
Keywords: MATEMATICAS -- ENSEÑANZA SECUNDARIA -- PROGRAMAS DE ACTIVIDADES