Keyword: primary school children
Leysan R. Kayumova, Liliya N. Gainullina, Roza Sh. Akhmadieva, Valentin V. Matvienko, Ekaterina L. Kabakhidze
EURASIA J Math Sci Tech Ed, Volume 17, Issue 10, Article No: em2016
Lera A. Kamalova, Venera G. Zakirova
EURASIA J Math Sci Tech Ed, Volume 13, Issue 12, pp. 7813-7821