Exemplar exercise problems II — task. Mathematics CBSE, Class 8.

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1. The numerical expression

$\frac{3}{8} + \frac{(-5)}{7} = \frac{-19}{56}$ shows that

rational numbers are closed under multiplication.
addition of rational numbers is not commutative.
rational numbers are not closed under addition.
rational numbers are closed under addition.

2. Which of the following is not true?

rational numbers are closed under subtraction.
rational numbers are closed under division.
rational numbers are closed under multiplication.
rational numbers are closed under addition.

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