child calculates arithmetic problem orally mental portrait boy doing mathematics |
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| navigate by keyword : education boy school number learn learning lesson schoolboy arithmetic problem math kid intelligence count calculate schoolchild looking serious pupil formula brain exercise genius teaching solve science memory imagination think answer busy development examining finance intelligent preschooler method remember scientist algebra wisdom thought logic trained theory technology clever exam practice studying child calculates orally mental portrait mathematics |
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| Child calculates an arithmetic problem orally. Mental arithmetic. Portrait of a boy doing mathematics. |
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