Image: Mental calculation at primary school
Size of this preview: 800 × 597 pixels. Other resolutions: 320 × 239 pixels | 1,283 × 958 pixels.
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Description: A painting by Nikolai Petrovich Bogdanov-Belsky in the State Tretyakov Gallery, Moscow.
Title: Mental calculation at primary school
Credit: https://2.bp.blogspot.com/-Xqkw1mLEo0c/Vkn7CIAtRUI/AAAAAAAARPM/yiUOlkn5j-o/s1600/BogdanovBelsky_UstnySchet.jpg
Author: Nikolay Bogdanov-Belsky
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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