LCM of 4, 5, and 6 is the smallest number among all common multiples of 4, 5, and 6. The first few multiples of 4, 5, and 6 are (4, 8, 12, 16, 20 . . .), (5, 10, 15, 20, 25 . . .), and (6, 12, 18, 24, 30 . . .) respectively. There are 3 commonly used methods to find LCM of 4, 5, 6 - by division method, by prime factorization, and by listing multiples.
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| 1. | LCM of 4, 5, and 6 |
| 2. | List of Methods |
| 3. | Solved Examples |
| 4. | FAQs |
Answer: LCM of 4, 5, and 6 is 60.
Explanation:
The LCM of three non-zero integers, a(4), b(5), and c(6), is the smallest positive integer m(60) that is divisible by a(4), b(5), and c(6) without any remainder.
Let's look at the different methods for finding the LCM of 4, 5, and 6.
By Listing MultiplesBy Division MethodBy Prime Factorization MethodLCM of 4, 5, and 6 by Listing Multiples
To calculate the LCM of 4, 5, 6 by listing out the common multiples, we can follow the given below steps:
Step 1: List a few multiples of 4 (4, 8, 12, 16, 20 . . .), 5 (5, 10, 15, 20, 25 . . .), and 6 (6, 12, 18, 24, 30 . . .).Step 2: The common multiples from the multiples of 4, 5, and 6 are 60, 120, . . .Step 3: The smallest common multiple of 4, 5, and 6 is 60.∴ The least common multiple of 4, 5, and 6 = 60.
LCM of 4, 5, and 6 by Division Method
To calculate the LCM of 4, 5, and 6 by the division method, we will divide the numbers(4, 5, 6) by their prime factors (preferably common). The product of these divisors gives the LCM of 4, 5, and 6.
Step 2: If any of the given numbers (4, 5, 6) is a multiple of 2, divide it by 2 and write the quotient below it. Bring down any number that is not divisible by the prime number.Step 3: Continue the steps until only 1s are left in the last row.The LCM of 4, 5, and 6 is the product of all prime numbers on the left, i.e. LCM(4, 5, 6) by division method = 2 × 2 × 3 × 5 = 60.
LCM of 4, 5, and 6 by Prime Factorization
Prime factorization of 4, 5, and 6 is (2 × 2) = 22, (5) = 51, and (2 × 3) = 21 × 31 respectively. LCM of 4, 5, and 6 can be obtained by multiplying prime factors raised to their respective highest power, i.e. 22 × 31 × 51 = 60.Hence, the LCM of 4, 5, and 6 by prime factorization is 60.
☛ Also Check:
Example 2: Verify the relationship between the GCD and LCM of 4, 5, and 6.
Solution:
The relation between GCD and LCM of 4, 5, and 6 is given as,LCM(4, 5, 6) = <(4 × 5 × 6) × GCD(4, 5, 6)>/
∴ GCD of (4, 5), (5, 6), (4, 6) and (4, 5, 6) = 1, 1, 2 and 1 respectively.Now, LHS = LCM(4, 5, 6) = 60.And, RHS = <(4 × 5 × 6) × GCD(4, 5, 6)>/
Example 3: Calculate the LCM of 4, 5, and 6 using the GCD of the given numbers.
Solution:
Prime factorization of 4, 5, 6:
4 = 225 = 516 = 21 × 31Therefore, GCD(4, 5) = 1, GCD(5, 6) = 1, GCD(4, 6) = 2, GCD(4, 5, 6) = 1We know,LCM(4, 5, 6) = <(4 × 5 × 6) × GCD(4, 5, 6)>/
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FAQs on LCM of 4, 5, and 6
What is the LCM of 4, 5, and 6?
The LCM of 4, 5, and 6 is 60. To find the least common multiple (LCM) of 4, 5, and 6, we need to find the multiples of 4, 5, and 6 (multiples of 4 = 4, 8, 12, 16 . . . . 60 . . . . ; multiples of 5 = 5, 10, 15, 20 . . . . 60 . . . . ; multiples of 6 = 6, 12, 18, 24 . . . . 60 . . . . ) and choose the smallest multiple that is exactly divisible by 4, 5, and 6, i.e., 60.
What is the Least Perfect Square Divisible by 4, 5, and 6?
The least number divisible by 4, 5, and 6 = LCM(4, 5, 6)LCM of 4, 5, and 6 = 2 × 2 × 3 × 5
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What are the Methods to Find LCM of 4, 5, 6?
The commonly used methods to find the LCM of 4, 5, 6 are:
Division MethodListing MultiplesPrime Factorization MethodHow to Find the LCM of 4, 5, and 6 by Prime Factorization?
To find the LCM of 4, 5, and 6 using prime factorization, we will find the prime factors, (4 = 22), (5 = 51), and (6 = 21 × 31). LCM of 4, 5, and 6 is the product of prime factors raised to their respective highest exponent among the numbers 4, 5, and 6.⇒ LCM of 4, 5, 6 = 22 × 31 × 51 = 60.