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Class 9 Maths Important Questions for Number System




Here we are trying to give the Class 9 Maths Important Questions for Number System. It tests the basic concepts and at the same makes the student comfortable with the questions

1. Without actually performing division, state which of these number will terminating decimal expression or non terminating repeating decimal expression

 

  1. 7/25
  2. 3/7
  3. 29/343
  4. 6/15
  5. 77/210
  6. 11/67
  7. 15/27

 

Solution

Those rational number which can be expressed in form x/2m X5n    are terminating expression and those can not be are non terminating decimal expression

Terminating decimal:  (a), (d)

Non terminating repeating decimal: (b), (c), (e), (f), (g)

2. Rationalize the expression

a) $\frac{2+\sqrt{3}}{2-\sqrt{3}}$

b)$\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}$

Solution

 

3) Write 10 rational number between

a) 4 and 5

b) 1/2 and 1/3

 

4) Represent in rational form.

a)1.232323….

b) 1.25

c) 3.67777777

5) Prove that $2+\sqrt{3}$ is a irrational number

 

 

6) True or False statement

a) Every Real number is a Rational numbers

b) Every irrational number is a Real numbers

c) Every whole number is a natural number

d) Every integer is a rational number

e) Every rational number is a whole number

f) There are infinite integers between two integers

g) There are finite rational number between 2 and 3

h) $\sqrt{3}$ Can be expressed in the form $\sqrt{3}$/1,so it is a rational number

 

Solution

  1. False ,since real number includes both rational and irrational number
  2. True
  3. False,as 0 is not natural number
  4. True ,as any integer can be expressed in the form p/q
  5. False
  6. False,There are finite integer between two integers
  7. False
  8. False

 

 

Multiple choice Questions

 

7) which is of these a irrational number

a) 3/2

b) $\frac{\sqrt{12}}{\sqrt{3}}$

c) 5.222222……

d) $\frac{\sqrt{12}}{2}$

 

Solution (d)

8. Which is of these a rational number?

a)  1.234567…..

b) .333333…

c)  1.423153652….

d) None of these

 

Solution (b)

 

9) if $x=2+\sqrt{3}$ and $y=\frac{1}{2+\sqrt{3}}$

Then what is the value of  x2 +y2

 

a)8

b)10

c) 12

d) 14

 

Solution ©

Simplify Following expression


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