4 rational because 4 times 4 is 16 and there is nothing to start a pattern, its a plain number so its rational, irrational would be a number with no pattern like 18.86743038434953949345..., another rational is like 18.3333333... or 18.123123123123123123123123123..., or 95.8989898989898989..., because they have patterns.
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The square root of 200 is irrational.
Irrational.
Irrational Number
4.6 is rational.
-4.9 is a rational number. If a number is irrational, then it can not be expressed as a finite number of digits. A few examples of irrational numbers are: pi, the square root of any integer which is not square and the golden ratio (phi).