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Mathematics

Separate the rationals and irrationals from among the following numbers :

(i) -8

(ii) 25\sqrt{25}

(iii) 35\dfrac{-3}{5}

(iv) 8\sqrt{8}

(v) 0

(vi) π

(vii) 53\sqrt[3]{5}

(viii) 2.42.\overline{4}

(ix) 3-\sqrt{3}

Rational Irrational Nos

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Answer

(i) -8 can be expressed in the form of pq\dfrac{p}{q}, where p and q are integers and q ≠ 0.

Hence, -8 is a rational number.

(ii) 25=5=51\sqrt{25} = 5 = \dfrac{5}{1}

Thus, 25\sqrt{25} can be expressed in the form of pq\dfrac{p}{q}, where p and q are integers and q ≠ 0.

Hence, 25\sqrt{25} is a rational number.

(iii) 35\dfrac{-3}{5} can be expressed in the form of pq\dfrac{p}{q}, where p and q are integers and q ≠ 0.

Hence, 35\dfrac{-3}{5} is a rational number.

(iv) 8\sqrt{8} is square root of non-perfect square i.e. 8.

Hence, 8\sqrt{8} is an irrational number.

(v) 0 can be expressed in the form of pq\dfrac{p}{q}, where p and q are integers and q ≠ 0.

Hence, 0 is a rational number.

(vi) π is a non-terminating and non-repeating decimal.

Hence, π is an irrational number.

(vii) 53\sqrt[3]{5} is cube root of non-perfect cube i.e. 5.

Hence, 53\sqrt[3]{5} is an irrational number.

(viii) 2.42.\overline{4} is a repeating decimal.

Hence, 2.42.\overline{4} is a rational number.

(ix) 3-\sqrt{3} is square root of non-perfect square i.e. 3.

Hence, 3-\sqrt{3} is an irrational number.

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