LCM of 15 and 60

LCM of 15 and 60 is the smallest number among all common multiples of 15 and 60. The first few multiples of 15 and 60 are (15, 30, 45, 60, 75, . . . ) and (60, 120, 180, 240, 300, 360, . . . ) respectively. There are 3 commonly used methods to find LCM of 15 and 60 - by division method, by prime factorization, and by listing multiples.

Answer: LCM of 15 and 60 is 60.

Explanation:

The LCM of two non-zero integers, x(15) and y(60), is the smallest positive integer m(60) that is divisible by both x(15) and y(60) without any remainder.

The methods to find the LCM of 15 and 60 are explained below.

• By Prime Factorization Method
• By Division Method
• By Listing Multiples

LCM of 15 and 60 by Prime Factorization

Prime factorization of 15 and 60 is (3 × 5) = 3¹ × 5¹ and (2 × 2 × 3 × 5) = 2² × 3¹ × 5¹ respectively. LCM of 15 and 60 can be obtained by multiplying prime factors raised to their respective highest power, i.e. 2² × 3¹ × 5¹ = 60.
Hence, the LCM of 15 and 60 by prime factorization is 60.

LCM of 15 and 60 by Division Method

To calculate the LCM of 15 and 60 by the division method, we will divide the numbers(15, 60) by their prime factors (preferably common). The product of these divisors gives the LCM of 15 and 60.

• Step 1: Find the smallest prime number that is a factor of at least one of the numbers, 15 and 60. Write this prime number(2) on the left of the given numbers(15 and 60), separated as per the ladder arrangement.
• Step 2: If any of the given numbers (15, 60) 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 15 and 60 is the product of all prime numbers on the left, i.e. LCM(15, 60) by division method = 2 × 2 × 3 × 5 = 60.

LCM of 15 and 60 by Listing Multiples

To calculate the LCM of 15 and 60 by listing out the common multiples, we can follow the given below steps:

• Step 1: List a few multiples of 15 (15, 30, 45, 60, 75, . . . ) and 60 (60, 120, 180, 240, 300, 360, . . . . )
• Step 2: The common multiples from the multiples of 15 and 60 are 60, 120, . . .
• Step 3: The smallest common multiple of 15 and 60 is 60.

∴ The least common multiple of 15 and 60 = 60.

☛ Also Check:

• LCM of 16 and 28 - 112
• LCM of 5 and 11 - 55
• LCM of 45 and 120 - 360
• LCM of 20 and 50 - 100
• LCM of 6, 12, 18 and 24 - 72
• LCM of 12 and 30 - 60
• LCM of 12 and 45 - 180

FAQs on LCM of 15 and 60

What is the LCM of 15 and 60?

The LCM of 15 and 60 is 60. To find the LCM of 15 and 60, we need to find the multiples of 15 and 60 (multiples of 15 = 15, 30, 45, 60; multiples of 60 = 60, 120, 180, 240) and choose the smallest multiple that is exactly divisible by 15 and 60, i.e., 60.

How to Find the LCM of 15 and 60 by Prime Factorization?

To find the LCM of 15 and 60 using prime factorization, we will find the prime factors, (15 = 3 × 5) and (60 = 2 × 2 × 3 × 5). LCM of 15 and 60 is the product of prime factors raised to their respective highest exponent among the numbers 15 and 60.
⇒ LCM of 15, 60 = 2² × 3¹ × 5¹ = 60.

What is the Least Perfect Square Divisible by 15 and 60?

The least number divisible by 15 and 60 = LCM(15, 60)
LCM of 15 and 60 = 2 × 2 × 3 × 5 [Incomplete pair(s): 3, 5]
⇒ Least perfect square divisible by each 15 and 60 = LCM(15, 60) × 3 × 5 = 900 [Square root of 900 = √900 = ±30]
Therefore, 900 is the required number.

What are the Methods to Find LCM of 15 and 60?

The commonly used methods to find the LCM of 15 and 60 are:

• Listing Multiples
• Division Method
• Prime Factorization Method

If the LCM of 60 and 15 is 60, Find its GCF.

LCM(60, 15) × GCF(60, 15) = 60 × 15
Since the LCM of 60 and 15 = 60
⇒ 60 × GCF(60, 15) = 900
Therefore, the GCF (greatest common factor) = 900/60 = 15.