File:Mental calculation at primary school.jpg
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current | 13:11, 22 March 2021 | 1,283 × 958 (342 KB) | Ingafube | Uploaded a work by Nikolay Bogdanov-Belsky from https://2.bp.blogspot.com/-Xqkw1mLEo0c/Vkn7CIAtRUI/AAAAAAAARPM/yiUOlkn5j-o/s1600/BogdanovBelsky_UstnySchet.jpg with UploadWizard |
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