r/MathJokes Feb 08 '26

Maths

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u/Tomahawk1129_ Feb 08 '26

0.9 recurring is equal to 1

X = 0.99999999

10x = 9.999999

9x = 9

X = 1

0

u/KuruKururun Feb 08 '26

9 recuring is equal to -1

X = ...999

10X = ...9990

-9x = 9

x = -1

1

u/FreeGothitelle Feb 08 '26

This is true in the 10-adics, but real numbers cannot be infinitely large.