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Fundamental Theorem Of Arithmetic

The Fundamental Theorem of Arithmetic states that every composite number can be expressed as a product of primes, and this factorization is unique, apart from the order in which the prime factors occur. It forms the basis for finding the Highest Common Factor and Least Common Multiple of positive integers.

Key Concepts

A prime number has only two factors, 1 and itself, while a composite number has more than two factors.
The uniqueness of the theorem guarantees that no matter how you factorize a composite number, the specific set of prime factors remains exactly the same.
This theorem is applied to find the HCF and LCM of numbers using the prime factorization method and to prove the irrationality of numbers like root 2 and root 3.

Formula & Equation

HCF(a, b) x LCM(a, b) = a x b

Here, a and b are two positive integers. HCF is their Highest Common Factor and LCM is their Least Common Multiple.

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Common Misconceptions

Myth: Students often think that changing the order of prime factors creates a different prime factorization.
Fact: The theorem explicitly states that the factorization is unique apart from the order. For example, 2 x 3 and 3 x 2 represent the exact same prime factorization for the number 6.

Real World Applications

Cryptography and digital security systems rely heavily on the prime factorization of extremely large numbers, which is a direct application of this theorem.
Determining the exact time when two different events with different repeating intervals will occur together again, such as flashing traffic lights, by calculating the LCM.

Frequently Asked Questions

What is the Fundamental Theorem of Arithmetic in Class 10?
It is a mathematical rule stating that every composite number can be uniquely written as a product of prime numbers, regardless of the order of the factors.
How is the Fundamental Theorem of Arithmetic used to find HCF and LCM?
The HCF is the product of the smallest power of each common prime factor, while the LCM is the product of the greatest power of each prime factor involved in the numbers.

Keep Learning

Prime FactorizationPrime NumberComposite Number