Classify each number as rational or irrational. 0.167 2/9 π 225√

A number is rational if we can write that number as a fraction.

A number is irrational if we can not write as a fraction. This means if a number has non repeating and non terminating decimal values then it is an irrational number.

Now let us look at our given numbers one by one.

We can write as . Hence it is a rational number.

This number is already written as fraction. It is a rational number.

We can not write as a fraction because the equivalent   decimal values of   are  non repeating and non terminating. Therefore   is an irrational number. Remember that is just an approximation for . It isn't the actual value of .

is equivalent to 15. We can write 15 as a fraction like . Therefore is a rational number.

72 is the answer to this problem