Lightning Talk - 1 = 0.999...
summary
Claim: 0.999... equals 1. Method: name the repeating decimal let x = 0.999..., multiply to shift the decimal, subtract to cancel the tail 10x - x = 9, then divide to get 1 so 0.999... = 1. Extra example shows 0.373737... turning into 37/99 by the same algebraic trick. Lightning format runs under three minutes and frames the stepwise algebra as the decisive tool.
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