Question 634848
1)    0.12  is  <font color="red">rational</font>


2)    2(pie)  is  <font color="green">irrational</font>


3)   &#8730;12  is  <font color="green">irrational</font>


4)   0.3691215182124  is  <font color="green">irrational</font>


5)   1/2 &#8730;8  is  <font color="green">irrational</font>



Remember that a number is rational if you can represent it as a fraction of integers (or whole numbers). 


Since {{{0.12=12/100}}}, it is rational. The other problems cannot be represented as fractions of integers. So they are irrational.


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