2215-3470 2215-3470 S2215-34702018000200042 10.15359/ru.32-2.3 Costa Rica Costa Rica 00 12 2018 00 12 2018 32 2 42 56

2007 5 14-20 2000 19 2 2 141-73 2007 39 5-6 5-6 355-64 (200 1 207-20 Inter-American Development Bank 2006 2013 3206 1986 7 2 2 33-115 2007 39 5-6 5-6 395-403 1990 55-69 2000 3 3 3 265-92 2003 2009 1996 2008 2001 6 1 1 129-59 2001 2003 211-33 2007 763-804 2008 47 5 5 1-15 2016 263-86 2017 39-56 2008 319 National Council of Teachers of Mathematics 2000 1 National Research Council 1999 1998 107-12 2009 12 3 3 355-82 2008 xii 159-92 2007 39 5- 6 5- 6 523-36 2016 19-30 1985 1992 334-70 1989 3 1-22 2003 39 191-210 2007 39 5-6 5-6 353 2009 2 1999 2 1 1 543-54