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I think what you mean is that the repeating decimal 0.666666666..., which is equal to 2/3, when you round it to any number of decimal places, ends in 7. For example, rounded to 3 places it is 0.667. This is because the digit in the fourth place, 6, is 5 or higher, so it rounds up to 0.667.
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Earn +20 ptsQ: Why the repeating decimal 0.66 ends in 7?
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