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Gabor Csardi · Answer 1 · 2019-01-10T16:16:31+0000

Non-repeating decimals that go on forever are irrational. Everything else is considered rational.

7.6 is rational, it does not go on forever
22/7 is irrational, it goes on forever without repeating itself

$\sf 1.\overline{01}$ is rational, it is a repeating decimal
π is irrational, it goes on forever without repeating itself

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