2215-3470 2215-3470 S2215-34702021000100038 10.15359/ru.35-1.3 Spain Spain 00 06 2021 00 06 2021 35 1 38 54

2019 21 5 5 102-27 2017 31 59 59 1061-81 2018 32 61 61 526-48 2016 5 1 1 74-10 2020 34 66 66 69-88 2015 8 1 1 4-41 2017 13 13 1893-918 2002 2020 34 66 66 40-68 2018 44 44 1-22 1993 86 5 5 404-7 2008 14 2 2 86-91 1993 2017 255-64 2017 10 2 2 1-23 2018 34 2 2 62-75 2013 82 1 1 97-124 2010 33 1 1 89-105 2012 1 1 23-37 2018 44 44 2018 44 44 2013 11 11 111-32 2007 39 1 1 127-35 2019 39 1 1 37-42 2009 19 19 34-46 2017 31 57 57 90-113 2018 13 13 63-83 2013 8 1 1 46-74 2012 2011 2008 39 4 4 372-400 2019 21 1 1 64-82 14 3 3 2012 2 2 53-70 2015 38 152 152 14-30 2018 32 61 61 480-502 2017 19 1 1 122-37 2020 22 1 1 88-111 32 60 60 231-54 National Council of Teachers of Mathematics 2000 2004 2018 16 6 6 1091-113 2013 34 2 2 123-50 2011 13 1 1 141-78 2018 21 1 1 63-94 2016 19 1 1 71-98 1994 3 1 1 3-18 2015 33 2 2 29-49 2005 8 3 3 255-81 2008 2 2 321-54 1984 2020 12 25 25 127-44 2015 11 19 19 55-75 1986 15 2 2 4-14 1953 2001