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257 LearnersLast updated on November 29th, 2024
LCM of 9 and 12
The Least common multiple (LCM) is the smallest number that is divisible by the numbers 9 and 12. 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.
What is the LCM of 9 and 12?
The LCM of 9 and 12 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.
How to find the LCM of 9 and 12 ?
There are various methods to find the LCM, Listing method, prime factorization method and division method are explained below;
LCM of 9 and 12 using the Listing multiples method
The LCM of 9 and 12 can be found using the following steps;
Steps:
1. Write down the multiples of each number:
Multiples of 9= 9,18,27,36…
Multiples of 12 = 12,24,36…
2. Ascertain the smallest multiple from the listed multiples of 9 and 12.
The LCM (Least common multiple)
The least common multiple of the numbers 9 and 12 is 36.
LCM of 9 and 12 using the Prime Factorization
The prime factors of each number are written, and then the highest power of the prime factors is multiplied to get the LCM.
Steps:
1. Find the prime factors of the numbers:
Prime factorization of 9 = 3×3
Prime factorization of 12 = 2×2×3
2. Multiply the highest power of each factor ascertained to get the LCM:
LCM (9,12) = 2×2×3×3 = 36
LCM of 9 and 12 using the Division Method
The Division Method involves simultaneously dividing the numbers by their prime factors and multiplying the divisors to get the LCM.
Steps:
1. Write down the numbers in a row;
2. A prime integer that is evenly divisible into at least one of the provided numbers should be used to divide the row of numbers.
3. Continue dividing the numbers until the last row of the results is ‘1’ and bring down the numbers not divisible by the previously chosen prime number.
4. The LCM of the numbers is the product of the prime numbers in the first column, i.e,
2×2×3×3= 36
LCM (9,12) = 36
Common Mistakes and how to avoid them while finding the LCM of 9 and 12
LCM of 9 and 12 Examples
Problem 1
Bells at Moonwood High School ring for the assembly, 9 and 12 minutes apart, respectively. If they ring together at 10:00 AM, when will they ring together again?
Explanation
Problem 2
The LCM of a and b is 36 and the sum of a and b is 21. Find a and b.
Explanation
Problem 3
The LCM of 9 and ‘b’ is 36. Ascertain b.
Explanation
Problem 4
Two vans arrive at a store every 9 and 12 minutes, respectively, for a delivery. If they both arrive at the station at 8:00 AM, when will they arrive together again?
Explanation
FAQ’s on LCM of 9 and 12
1.Why is the LCM of 9 and 12 not simply their product (9 × 12 = 108) ?
2.What is the relationship between the Highest common factor (HCF) and LCM of 9 and 12?
3.What is the relationship of the LCM and the HCF between the digits 9 and 12? Elaborate using a formula?
Important glossaries for LCM of 9 and 12
- 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.
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Hiralee Lalitkumar Makwana
About the Author
Hiralee Lalitkumar Makwana has almost two years of teaching experience. She is a number ninja as she loves numbers. Her interest in numbers can be seen in the way she cracks math puzzles and hidden patterns.
Fun Fact
: She loves to read number jokes and games.
