Geodesic
Counting in the system of Professor S.A.~Rachinsky (190th birthday)
Matematičeskoe obrazovanie, Tome 108 (2023) no. 4, pp. 79-83

Voir la notice de l'article provenant de la source Math-Net.Ru

The article discusses the possibilities of using pedagogical ideas for developing mental arithmetic skills from the system of the famous methodologist Professor Sergei Aleksandrovich Rachinsky. The manuals published by the authors are an inexhaustible storehouse of practical tasks for the modern school. 
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S. V. Zharov. Counting in the system of Professor S.A.~Rachinsky (190th birthday). Matematičeskoe obrazovanie, Tome 108 (2023) no. 4, pp. 79-83. http://geodesic.mathdoc.fr/item/MO_2023_108_4_a8/