## RS Aggarwal Class 9 Solutions Chapter 1 Real Numbers Ex 1D

These Solutions are part of RS Aggarwal Solutions Class 9. Here we have given RS Aggarwal Solutions Class 9 Chapter 1 Real Numbers Ex 1D.

**Other Exercises**

- RS Aggarwal Solutions Class 9 Chapter 1 Real Numbers Ex 1A
- RS Aggarwal Solutions Class 9 Chapter 1 Real Numbers Ex 1B
- RS Aggarwal Solutions Class 9 Chapter 1 Real Numbers Ex 1C
- RS Aggarwal Solutions Class 9 Chapter 1 Real Numbers Ex 1D
- RS Aggarwal Solutions Class 9 Chapter 1 Real Numbers Ex 1E
- RS Aggarwal Solutions Class 9 Chapter 1 Real Numbers Ex 1F

**Question 1.**

**Add**

**Solution:**

**Question 2.**

**Multiply**

**Solution:**

**Question 3.**

**Divide**

**Solution:**

**Question 4.**

**Simplify**

**Solution:**

**Question 5.**

**Represent √3.2 geometrically on the number line.**

**Solution:**

(i) Draw a line segment AB = 3.2 units (cm) and extend it to C such that BC = 1 unit.

(ii) Find the mid-point O of AC.

(iii) With centre O and OA as radius draw a semicircle on AC

(iv) Draw BD ⊥ AC meeting the semicircle at D.

(v) Join BD which is √3.2 units.

(vi) With centre B and radius BD, draw an arc meeting AC when produced at E.

Then BE = BD = √3.2 units. Ans.

**Question 6.**

**Represent √7.28 geometrically on the number line.**

**Solution:**

(i) Draw a line segment AB = 7.28 units and produce is to C such that BC = 1 unit (cm)

(ii) Find the mid-point O of AC.

(iii) With centre O and radius OA, draw a semicircle on AC.

(iv) Draw a perpendicular BD at AC meeting the semicircle at D

Then BD = √7.28 units.

(v) With centre B and radius BD, draw an arc which meet AC produced at E.

Then BE = BD = √7.28 units.

**Question 7.**

**Mention the closure property, associative law, commutative law, existence of identity, existence of inverse of each real number for each of the operations (i) addition (ii) multiplication on real numbers.**

**Solution:**

(A) For Addition

(i) Closure property: The sum of two real numbers is always a real number.

(ii) Associative Law : (a + b) + c = a + (b + c), for all values of a, b and c.

(iii) Commutative Law : a + b = b + a for all real values of a and b.

(iv) Existance of Additive Identity : 0 is the real number such that: 0 + a = a + 0 = afor every real value of a.

(v) Existance of addtive inverse : For each real value of a, there exists a real value (-a) such that a + (-a) = (-a) + a = 0, Then (a) and (-a) are called the additive inverse of each other.

(v) Existence of Multiplicative Inverse. For each non zero real number a, there exists a real number such that a . = . a = 1

a and are called multiplicative inverse or reciprocal of each other.

(B) Multiplication

(i) Closure property: The product of two real numbers is always a real number.

(ii) Associative law : ab(c) = a(bc) for all real values of a, b and c

(iii) Commutative law : ab=ba for all real numbers a and b

(iv) Existance of Multiplicative Identity: clearly is a real number such that 1.a = a.1 = a for every value of a.

Hope given RS Aggarwal Solutions Class 9 Chapter 1 Real Numbers Ex 1D are helpful to complete your math homework.

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