Tips for mentally calculating the 9 multiplication table with your hands
Seeing each finger as a number from 1 to 10, you can easily give the result when multiplying by 9.
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Seeing each finger as a number from 1 to 10, you can easily give the result when multiplying by 9.
Managing agency: Nghe An Provincial Party Committee
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Issued by the Ministry of Information and Communications on March 24, 2022