NCERT Class 8 Solutions: Rational Numbers (Chapter 1) Exercise 1.1 – Part 3

Q-5 Name the property under multiplication used in each of the following.

  1. 45×1=1×45=45

  2. 1317×27=27×1317

  3. 1929×2919=1

Solution:

  1. 45×1=1×45=45

    Here using the multiplicative identity

    Given the multiplicative identity is using the equations

    Given the Multiplicative Identity

    Given the multiplicative identity is using the equations

  2. 1317×27=27×1317

    Here using the commutative identity.

    Given the commutative identity is using the equations

    Given the Commutative Identity

    Given the commutative identity is using the equations

  3. 1929×2919=1

    Here using the Multiplicative inverse

    Given the Multiplicative inverse identity is using the equations

    Given the Multiplicative Inverse

    Given the Multiplicative inverse identity is using the equations

Q-6 Multiply 613 by the reciprocal of 716

Solution:

Given the reciprocal of any number

Given the Reciprocals

Given the reciprocal of any number

  • Reciprocalof716=167

  • Here find the 6 Multiply 613 by the reciprocal of 716

  • =613×(Reciprocalof716)

    =613×167

    =9691

    =9691

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