31/7
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3 and 1/7
5 1/2
2.4 as a mixed number in simplest form = 22/5
3 and 1/7
22/7 is not equal to pi but only close to being equal to pi.When you divide 22 by 7 you get a rational number where the decimal numbers...repeat over and over again.22/7 =3.142857142857142857142857142857142857142857142857...You can not express pi as a fraction.When you write it out in decimal form the numbers never repeat.Those are the reasons that it is called irrational.