NCERT Class 8 Solutions: Rational Numbers (Chapter 1) Exercise 1.1 – Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q-7) Tell what property allows you to compute

Solution:

By the property of associativity

Image Discribing Associative Property a + (B + C) = (A + B) …

Q-8) Is the multiplicative inverse of ? Why or why not?

Solution:

If it will be the multiplicative inverse then their product will be 1.

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Multiplicative Inverse of a Number as Reciprocal

Therefore,

Hence, is not the multiplicative inverse.

Q-9 Is the multiplicative inverse of ? Why or why not?

Solution:

If it will be the multiplicative inverse then their product will be 1.

Multiplicative Inverse of Fractions as Reciprocal

Also

That is

Hence, is the multiplicative inverse.

Q-10 Write

  1. The rational number that does not have a reciprocal.
  2. The rational numbers that is equal to their reciprocals.
  3. The rational number that is equal to its negative.

Solution:

Given the Rational and Irrational Number in Figure and Find …
  1. 0 (Zero) is the rational number which does not have a reciprocal.
  2. 1 and -1 are the rational numbers which are equal to their reciprocals

  1. 0 is the rational number that is equal to its negative

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