2215-34702215-3470S2215-3470201800020004210.15359/ru.32-2.3Costa RicaCosta Rica001220180012201832242562007514-2020001922141-732007395-65-6355-64(2001207-20Inter-American Development Bank200620133206198672233-1152007395-65-6395-403199055-692000333265-9220032009199620082001611129-5920012003211-332007763-804200847551-152016263-86201739-562008319National Council of Teachers of Mathematics20001National Research Council19991998107-1220091233355-822008xii159-922007395- 65- 6523-36201619-3019851992334-70198931-22200339191-2102007395-65-6353200921999211543-54