If you can write the entire number, it is rational.
0.32416 is rational. As the ratio of integers, it can be written as 1013/3125.
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It will also be a rational number if it has a repeating decimal fraction.
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An irrational number has a decimal fraction that continues forever with no repeats. You can never write down the entire number without using some sort of symbol for it, such as π or √2.
