Class 9 Exam  >  Class 9 Notes  >  Mathematics (Maths) Class 9  >  Very Short Question Answer: Number Systems

Class 9 Maths Chapter 1 Question Answers - Number System

Q1: Simplify: (√5 + √2)2.
Ans:

Here, (√5 + √22 = (√52 + 2√5√2 + (√2)2
= 5 + 2√10 + 2
= 7 + 2√10

Q2: Find the value of √(3)- 2.
Ans:

Class 9 Maths Chapter 1 Question Answers - Number System

Q3: Identify a rational number among the following numbers :
2 + √2, 2√2, 0 and π
Ans:

0 is a rational number.

Q4: Express 1.8181… in the form pq where p and q are integers and q ≠ 0.
Ans:

Let x =1.8181… …(i)
100x = 181.8181… …(ii) [multiplying eqn. (i) by 100]
99x = 180
[subtracting (i) from (ii)]
x = 18099
Hence, 1.8181…
= 18099
= 2011

Q5: Simplify : √45 – 3√20 + 4√5
Ans:

√45 – 3√20 + 4√5
= 3√5 – 6√5 + 4√5
= √5.

Q6: Find the value of’ Class 9 Maths Chapter 1 Question Answers - Number System
Ans:

Class 9 Maths Chapter 1 Question Answers - Number System

Q7: Find the value of Class 9 Maths Chapter 1 Question Answers - Number System
Ans:

Class 9 Maths Chapter 1 Question Answers - Number System

The document Class 9 Maths Chapter 1 Question Answers - Number System is a part of the Class 9 Course Mathematics (Maths) Class 9.
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