Question 77
Rational numbers are closed under addition and multiplication but not under subtraction.

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Solution

False
Rational numbers are closed under addition, subtraction and multiplication.

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Q. Question 77
Rational numbers are closed under addition and multiplication but not under subtraction.

Question 4
Which of the following is not true?
(a) rational numbers are closed under addition.
(b) rational numbers are closed under subtraction.
(c) rational numbers are closed under multiplication.
(d) rational numbers are closed under division.

Q. Question 104
Give one example each to show that the rational numbers are closed under addition, subtraction and multiplication. Are rational numbers closed under division? Give two examples in support of your answer.

Question 3
The numerical expression $\frac{3}{8} + \frac{(- 5)}{7} = \frac{- 19}{56}$ shows that:
(a) rational numbers are closed under addition.
(b) rational numbers are not closed under addition.
(c) rational numbers are closed under multiplication.
(d) addition of rational numbers is not commutative.

Q. Give one example each to show that the rational numbers are closed under addition, subtraction and multiplication. Are rational numbers closed under division? Give two examples in support of your answer.

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Identities of Mathematical Operations

Standard VIII Mathematics

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Question 77 Rational numbers are closed under addition and multiplication but not under subtraction.

False Rational numbers are closed under addition, subtraction and multiplication.

Question 77
Rational numbers are closed under addition and multiplication but not under subtraction.

False
Rational numbers are closed under addition, subtraction and multiplication.