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119 Learners

Last updated on ** September 17th, 2024**

The Least common multiple (LCM) is the smallest number that is divisible by the numbers 3 and 9. The LCM can be found using the listing multiples method, the prime factorization and/or division methods. LCM helps to solve problems with fractions and scenarios like scheduling or aligning repeating cycle of events.

The LCM of 3 and 9 is the smallest positive integer, a multiple of both numbers. By finding the LCM, we can simplify the arithmetic operations with fractions to equate the denominators.

There are various methods to find the LCM, Listing method, prime factorization method and division method are explained below;

The LCM of 3 and 9 can be found using the following steps:

**Steps:**

Write down the multiples of each number

— Multiples of 3 = 3, 6, 9, 12, 15, 18, …

— Multiples of 9 = 9, 18, 27, 36, …

Ascertain the smallest multiple from the listed multiples

— The least common multiple is 9.

The prime factors of each number are written, and then the highest power of the prime factors is multiplied to get the LCM.

**Steps:**

- Find the prime factors of the numbers:

— Prime factorization of 3 = 3

— Prime factorization of 9 = 3 × 3

- Take the highest powers of each prime factor:

— Highest power of 3 = 3²

— Multiply the highest powers to get the LCM:

LCM(3, 9) = 3² = 9.

This method involves dividing both numbers by their common prime factors until no further division is possible, then multiplying the divisors to find the LCM.

**Steps:**

— Write the numbers, divide by common prime factors and multiply the divisors.

— 3 × 3 = 9

Thus, LCM(3, 9) = 9.

**Multiple:**A number and any integer multiplied.**Prime Factor:**A natural number (other than 1) that has factors that are one and itself.**Prime Factorization:**The process of breaking down a number into its prime factors is called Prime Factorization.**Co-prime numbers:**When the only positive integer that is a divisor of them both is 1, a number is co-prime.**Relatively Prime Numbers:**Numbers that have no common factors other than 1.**Fraction:**A representation of a part of a whole.