NCERT Solution: Knowing Our Numbers (Ex- 1.2)

# NCERT Solutions for Class 6 Maths Chapter 1 - Knowing Our Numbers (Ex- 1.2)

## FAQs on NCERT Solutions for Class 6 Maths Chapter 1 - Knowing Our Numbers (Ex- 1.2)

 1. What is the concept of place value in numbers?
Ans. The concept of place value in numbers refers to the value of a digit based on its position in a number. Each digit in a number has a place value, which is determined by its position relative to the decimal point. For example, in the number 345, the digit 5 is in the ones place, the digit 4 is in the tens place, and the digit 3 is in the hundreds place.
 2. How do you compare two numbers using the concept of place value?
Ans. To compare two numbers using the concept of place value, we start by comparing the digits in the highest place value position. If the digits are equal, we move to the next lower place value position and compare the digits there. This process continues until we find a difference in the digits or reach the ones place. The number with the greater digit in the highest place value position is greater than the other number.
 3. What are prime numbers and composite numbers?
Ans. Prime numbers are numbers that are greater than 1 and have only two factors, 1 and the number itself. For example, 2, 3, 5, 7, 11 are prime numbers. On the other hand, composite numbers are numbers that have more than two factors. In other words, composite numbers are divisible by numbers other than 1 and themselves. For example, 4, 6, 8, 9, 10 are composite numbers.
 4. How do you find the LCM (Least Common Multiple) of two numbers?
Ans. To find the LCM of two numbers, we first list the multiples of each number. Then, we identify the common multiples and choose the smallest one. Alternatively, we can use the prime factorization method, where we find the prime factors of both numbers and multiply them together, considering the highest power of each common factor.
 5. How do you find the HCF (Highest Common Factor) of two numbers?
Ans. To find the HCF of two numbers, we can use various methods. One method is the prime factorization method, where we find the prime factors of both numbers and identify the common factors. The HCF is the product of these common factors. Another method is the division method, where we repeatedly divide the larger number by the smaller number until the remainder is zero. The last divisor used is the HCF.
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