FAQs on NCERT Solutions for Class 6 Maths Chapter 1  Knowing Our Numbers (Ex 1.1)
1. What are natural numbers? 

Ans. Natural numbers are a set of positive numbers that start from 1 and continue indefinitely. They are used for counting and are denoted by the symbol "N". For example, 1, 2, 3, 4, 5, and so on are natural numbers.
2. What is the difference between whole numbers and natural numbers? 

Ans. The main difference between whole numbers and natural numbers is that natural numbers start from 1, whereas whole numbers include 0 as well. In other words, natural numbers are a subset of whole numbers. For example, 0, 1, 2, 3, 4, 5, and so on are whole numbers.
3. How are prime numbers different from composite numbers? 

Ans. Prime numbers are numbers that have only two factors, 1 and the number itself, whereas composite numbers have more than two factors. In simple terms, prime numbers cannot be divided evenly by any other number except 1 and themselves, while composite numbers can be divided evenly by multiple numbers. For example, 2, 3, 5, 7 are prime numbers, while 4, 6, 8, 9 are composite numbers.
4. What is the concept of place value in numbers? 

Ans. Place value is the value of a digit based on its position in a number. In our decimal number system, each digit's value depends on its position from the right or left in a number. The place value of the digits increases from right to left. For example, in the number 352, the place value of 2 is 2 (ones place), the place value of 5 is 50 (tens place), and the place value of 3 is 300 (hundreds place).
5. What are the different types of numbers in mathematics? 

Ans. There are various types of numbers in mathematics, including natural numbers, whole numbers, integers, rational numbers, and irrational numbers. Natural numbers are positive counting numbers, whole numbers include zero as well, integers are positive and negative numbers including zero, rational numbers can be expressed as fractions, and irrational numbers are numbers that cannot be expressed as fractions and have nonterminating decimal expansions.