**Q.1 Using appropriate properties find.
**

(ii)

= (Using Commutative property)

= (Using Distributive property)

=

=

=

=

=

=

=

**(ii)** Given,

= (Using Commutative property)

= (Using Distributive property)

=

=

=

=

=

=

**Q.2 Write the additive inverse of each of the following.
**

(iii)

We know,Â

Hence, the additive inverse ofÂ is .

(ii)

We know,Â

Hence, the additive inverse ofÂ is .

(iii)

We know,Â

Now,

Hence, the additive inverse ofÂ is .

(iv)

We know,Â

Hence, the additive inverse ofÂ is .

(v)

We know,Â

Hence, the additive inverse ofÂ is .

**Q.3 Verify that - (- x) = x for.**

(ii)

** Sol. **(i)

The additive inverse ofÂ is

Thus,

Now, the additive inverse ofÂ is

Thus,

Hence, proved that.

(ii)

The additive inverse ofÂ is

Thus,

The additive inverse ofÂ is

Hence, proved that .

**Q.4 Find the multiplicative inverse of the following.
**(i) -13

(ii)

(iii)

(iv)

(v)

(vi)1

(i) -13

Hence, the multiplicative inverse ofÂ -13 is equal to

(ii)

Hence, the multiplicative inverse ofÂ is equal to

(iii)

Hence, the multiplicative inverse ofÂ is equal to or 5.

(iv)

We know that, =

Hence, multiplicative inverse ofÂ is

(v)

We know that,

Hence, multiplicative inverse ofÂ is

(vi)1

We know that, -1 is equal to = -1

Hence, multiplicative inverse ofÂ -1 is -1.

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

(ii)

(iii)

** Sol. **(i)

We know that, 1 is the multiplicative identity for rational numbers.

Hence, the property of multiplicative identity is used here.

(ii)

When rational numbers are swapped between one operators and still their result does not change, then we say that the numbers follow the commutative property for that operation.

Hence, commutative property is used here.

(iii)

The reciprocal of is

Thus, multiplicative inverse property is used here.

**Q.6 Multiply ****by the reciprocal of ****.
**

So,

**Q.7 Tell what property allows you to compute **** as **

** Sol.** When rational numbers are rearranged between one or more same operations and still their result does not change then we say that they follow the associative property for that operation.

Thus, given equation follows the associative property.

**Q.8 IsÂ Â the multiplicative inverse of ****Â ? Why or why not?
**

Now, multiplying both numbers we get,

The result is not equal to 1.

Hence,Â Â is not the multiplicative inverse of .

**Q.9 Is 0.3 the multiplicative inverse ofÂ ****?Â Why or why not?
**

The multiplicative inverse ofÂ

Again, we know that

Hence, is the multiplicative inverse of 0.3

**Q.10 Write.
**

(ii) 1 and â€“ 1 are the rational numbers that are equal to their reciprocals.

(iii) Zero (0) is the rational number that is equal to its negative.

**Q.11 Fill in the blanks.
**

(ii) 1 and â€“ 1.

(iii) -1/5.

(iv) x.

(v) Rational Number.

(vi) Positive.

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