NCERT Solutions for Class 9 Maths Chapter-1 Number System Exercise 1.1
Q1. Is zero a rational number? Can you write it in the form p/q, where p and q are integers and q≠0?
Sol. Yes. 0= 0/1, 0/2, 0/3, etc., denominator ‘q’ can also be taken as a negative integer.
Q2. Find six rational numbers between 3 and 4.
Sol. To find six rational numbers between 3 and 4.
Multiply and Divide 3 and 4 by 7.
Q3. Find five rational numbers between 3/5and 4/5.
Sol. To find five rational numbers between 3/5 and 4/5.
Multiply and Divide 3 and 4 by 6.
Q4. 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.
Sol. (i) True, Whole Number is the collection of all-natural numbers.
(ii) False, Negative integers are not whole numbers.
(iii) False, ½, ⅛, etc. are not whole numbers.