# Maths Playing With Numbers part 31 (Questions : HCF) CBSE Class 6 Mathematics VI | Summary and Q&A

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August 27, 2016
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Maths Playing With Numbers part 31 (Questions : HCF) CBSE Class 6 Mathematics VI

## TL;DR

Learn how to find the HCF of numbers through prime factorization and discover interesting patterns with consecutive numbers.

## Key Insights

• 🧑‍🏭 Prime factorization is a useful method for finding the HCF of numbers and identifying common factors.
• 🦕 The HCF of consecutive numbers is always 1, regardless of whether they are even or odd.
• #️⃣ The pattern for finding the HCF of two consecutive even numbers is always 2.
• #️⃣ The HCF of co-prime numbers (numbers with no common factors other than 1) is always 1, not 0.

## Transcript

hello friends this video on playing with numbers part 31 is brought to you by exam feel calm no more for your exam pebble so let us quickly look at some of the questions based on HCF find the HCF of 34 and 102 so we will find it out by prime factorization method so 217 34 17 is a prime number so 17 into 1 so 34 can be written as 2 into 70 now let u... Read More

### Q: How can we find the HCF of numbers using the prime factorization method?

To find the HCF of numbers using prime factorization, we first prime factorize each number, then identify the common factors. The HCF is the product of these common factors.

### Q: What is the HCF of 34 and 102?

Prime factorizing 34 gives us 2 x 17, and prime factorizing 102 gives us 2 x 3 x 17. The common factors are 2 and 17, so the HCF of 34 and 102 is 34.

### Q: Can we find the HCF of more than two numbers using the prime factorization method?

Yes, we can find the HCF of multiple numbers by prime factorizing each number and identifying the common factors. For example, the HCF of 12, 45, and 75 is 3.

### Q: What is the HCF of two consecutive numbers?

The HCF of two consecutive numbers, such as 4 and 5, is always 1. This pattern holds for any pair of consecutive numbers.

### Q: Is the HCF of two consecutive even numbers always 2?

Yes, the HCF of two consecutive even numbers is always 2. This pattern is consistent for any pair of consecutive even numbers.

### Q: What about two consecutive odd numbers? What is their HCF?

The HCF of two consecutive odd numbers is always 1. This pattern applies to any pair of consecutive odd numbers.

### Q: Is 0 a possible HCF for any pair of numbers?

No, 0 is not a possible HCF. The HCF will always be a positive integer, and 1 will always be a common factor between any two numbers.

### Q: Can the HCF be verified using alternative methods?

Yes, the HCF can be verified by using alternative methods, such as finding common factors through factors of numbers. The result obtained will be the same.

## Summary & Key Takeaways

• The video explains how to find the HCF of numbers using the prime factorization method, demonstrated with examples of finding the HCF of 34 and 102, 12, 45, and 75, and 91, 112, and 49.

• It emphasizes the importance of identifying common factors in prime factorizations to determine the HCF accurately.

• The video also explores patterns in finding the HCF of consecutive numbers, even numbers, and odd numbers.