 # Class 9 Maths NCERT Solutions Chapter 1 Number System

In this page we have Class 9 Maths NCERT Solutions Chapter 1 Number System for Execise 1.1 . Hope you like them and do not forget to like , social share and comment at the end of the page.
Question 1
Is zero a rational number? Can you write it in the form p/q
, where p and q are integers and q  not equal to 0?
Solution:
Yes. Zero is a rational number as it can be represented as  0/1  or 0/2…
Question 2
Find six rational numbers between 3 and 4.
Solution
The six rational numbers
3.1 , 3.2, 3.3, 3.4, 3.5, 3.6

Question 3
Find five rational numbers between 3/5 and 4/5
Solution:
We need to find five rational numbers
So we multiply the denominator and numerator by (5+1) both the numbers
3/5= 18/30
4/5=24/30
So rational numbers will be in increasing order
19/30
20/30
21/30
22/30
23/30
Question 4
State whether the following statements are true or false. Give reasons for your answers.
(i) Every natural number is a whole number.
(ii) Every integer is a whole number.
(iii) Every rational number is a whole number
Solution:
(i) True; since the collection of whole numbers contains all natural numbers.
(ii) False; as integers may be negative but whole numbers are positive. For example: −3 is an integer but not a whole number.
(iii) False; as rational numbers may be fractional but whole numbers may not be

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Reference Books for class 9 Math

Given below are the links of some of the reference books for class 9 Math.

1. Mathematics for Class 9 by R D Sharma One of the best book for studying class 9 level mathematics. It has lot of problems to be solved.
2. Secondary School Mathematics for Class 9 by R S Aggarwal This is also as good as R.D. Sharma. Either this or the book by R.D. Sharma will do. I find book R.S. Aggarwal little bit more challenging than the one by R.D. Sharma.
3. Pearson IIT Foundation Series - Maths - Class 9 Buy this book if you want to challenge yourself further and want to prepare for JEE foundation.
4. Pearson IIT Foundation Physics, Chemistry & Maths combo for Class 9 Only buy if you are prepared to study extra topics and want to take your studies a step further. You might need help to understand topics in these books.

You can use above books for extra knowledge and practicing different questions.

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