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CBSESecondary School (English Medium) (5 to 8) Class 8
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Syllabus

Which of the following is not true?

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Question

Which of the following is not true?

Options

  • Rational numbers are closed under addition.

  • Rational numbers are closed under subtraction.

  • Rational numbers are closed under multiplication.

  • Rational numbers are closed under division.

MCQ
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Solution

Rational numbers are closed under division.

Explanation:

Rational numbers are not closed under division.

As, 1 and 0 are the rational numbers but `1/0` is not defined.

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Rational Numbers
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Q 4.
Chapter 1: Rational Numbers - Exercise [Page 9]

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NCERT Exemplar Mathematics Exemplar [English] Class 8
Chapter 1 Rational Numbers
Exercise | Q 4. | Page 9

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Add the following rational numbers.

\[\frac{6}{13} and \frac{- 9}{13}\]

 


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\[\frac{3}{5} + \frac{7}{3} + \frac{9}{5} + \frac{- 13}{15} + \frac{- 7}{3}\]

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Divide:

\[\frac{- 3}{4} \text{by} \frac{9}{- 16}\]

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Manavi and Kuber each receives an equal allowance. The table shows the fraction of their allowance each deposits into his/her saving account and the fraction each spends at the mall. If allowance of each is Rs. 1260 find the amount left with each.

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Every integer is a rational number but every rational number need not be an integer.


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