A frustrating math moment I remember as a ten year old is decimal numbers and understanding both place value and value of the digits (numbers) to the right of the decimal point. I vividly recall sitting at my kitchen table trying to understand why the first place value location directly after the decimal point was not the ‘oneths’ place but the tenths. Whole number place value begins with the ones, tens, hundreds and so forth as we add digits to the left, then why did the decimal digits not symmetrically repeat to the right of the decimal point?
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