LCM of 15 and 45

LCM of 15 and 45 is the smallest number among all common multiples of 15 and 45. The first few multiples of 15 and 45 are (15, 30, 45, 60, . . . ) and (45, 90, 135, 180, 225, 270, 315, . . . ) respectively. There are 3 commonly used methods to find LCM of 15 and 45 - by prime factorization, by division method, and by listing multiples.

Answer: LCM of 15 and 45 is 45.

Explanation:

The LCM of two non-zero integers, x(15) and y(45), is the smallest positive integer m(45) that is divisible by both x(15) and y(45) without any remainder.

The methods to find the LCM of 15 and 45 are explained below.

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

LCM of 15 and 45 by Listing Multiples

To calculate the LCM of 15 and 45 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, . . . ) and 45 (45, 90, 135, 180, 225, 270, 315, . . . . )
• Step 2: The common multiples from the multiples of 15 and 45 are 45, 90, . . .
• Step 3: The smallest common multiple of 15 and 45 is 45.

∴ The least common multiple of 15 and 45 = 45.

LCM of 15 and 45 by Division Method

To calculate the LCM of 15 and 45 by the division method, we will divide the numbers(15, 45) by their prime factors (preferably common). The product of these divisors gives the LCM of 15 and 45.

• Step 1: Find the smallest prime number that is a factor of at least one of the numbers, 15 and 45. Write this prime number(3) on the left of the given numbers(15 and 45), separated as per the ladder arrangement.
• Step 2: If any of the given numbers (15, 45) is a multiple of 3, divide it by 3 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 45 is the product of all prime numbers on the left, i.e. LCM(15, 45) by division method = 3 × 3 × 5 = 45.

LCM of 15 and 45 by Prime Factorization

Prime factorization of 15 and 45 is (3 × 5) = 3¹ × 5¹ and (3 × 3 × 5) = 3² × 5¹ respectively. LCM of 15 and 45 can be obtained by multiplying prime factors raised to their respective highest power, i.e. 3² × 5¹ = 45.
Hence, the LCM of 15 and 45 by prime factorization is 45.

☛ Also Check:

• LCM of 13 and 52 - 52
• LCM of 30 and 60 - 60
• LCM of 4, 6 and 10 - 60
• LCM of 2, 5 and 7 - 70
• LCM of 10, 20 and 25 - 100
• LCM of 5 and 15 - 15
• LCM of 24, 36 and 40 - 360

FAQs on LCM of 15 and 45

What is the LCM of 15 and 45?

The LCM of 15 and 45 is 45. To find the least common multiple (LCM) of 15 and 45, we need to find the multiples of 15 and 45 (multiples of 15 = 15, 30, 45, 60; multiples of 45 = 45, 90, 135, 180) and choose the smallest multiple that is exactly divisible by 15 and 45, i.e., 45.

What is the Relation Between GCF and LCM of 15, 45?

The following equation can be used to express the relation between GCF and LCM of 15 and 45, i.e. GCF × LCM = 15 × 45.

If the LCM of 45 and 15 is 45, Find its GCF.

LCM(45, 15) × GCF(45, 15) = 45 × 15
Since the LCM of 45 and 15 = 45
⇒ 45 × GCF(45, 15) = 675
Therefore, the greatest common factor = 675/45 = 15.

What is the Least Perfect Square Divisible by 15 and 45?

The least number divisible by 15 and 45 = LCM(15, 45)
LCM of 15 and 45 = 3 × 3 × 5 [Incomplete pair(s): 5]
⇒ Least perfect square divisible by each 15 and 45 = LCM(15, 45) × 5 = 225 [Square root of 225 = √225 = ±15]
Therefore, 225 is the required number.

Which of the following is the LCM of 15 and 45? 27, 45, 18, 11

The value of LCM of 15, 45 is the smallest common multiple of 15 and 45. The number satisfying the given condition is 45.