LCM of 4 and 8

LCM of 4 and 8 is the smallest number among all common multiples of 4 and 8. The first few multiples of 4 and 8 are (4, 8, 12, 16, 20, 24, . . . ) and (8, 16, 24, 32, 40, 48, . . . ) respectively. There are 3 commonly used methods to find LCM of 4 and 8 - by listing multiples, by prime factorization, and by division method.

Answer: LCM of 4 and 8 is 8.

Explanation:

The LCM of two non-zero integers, x(4) and y(8), is the smallest positive integer m(8) that is divisible by both x(4) and y(8) without any remainder.

Let's look at the different methods for finding the LCM of 4 and 8.

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

LCM of 4 and 8 by Division Method

To calculate the LCM of 4 and 8 by the division method, we will divide the numbers(4, 8) by their prime factors (preferably common). The product of these divisors gives the LCM of 4 and 8.

• Step 1: Find the smallest prime number that is a factor of at least one of the numbers, 4 and 8. Write this prime number(2) on the left of the given numbers(4 and 8), separated as per the ladder arrangement.
• Step 2: If any of the given numbers (4, 8) 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 and 8 is the product of all prime numbers on the left, i.e. LCM(4, 8) by division method = 2 × 2 × 2 = 8.

LCM of 4 and 8 by Listing Multiples

To calculate the LCM of 4 and 8 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, 24, . . . ) and 8 (8, 16, 24, 32, 40, 48, . . . . )
• Step 2: The common multiples from the multiples of 4 and 8 are 8, 16, . . .
• Step 3: The smallest common multiple of 4 and 8 is 8.

∴ The least common multiple of 4 and 8 = 8.

LCM of 4 and 8 by Prime Factorization

Prime factorization of 4 and 8 is (2 × 2) = 2² and (2 × 2 × 2) = 2³ respectively. LCM of 4 and 8 can be obtained by multiplying prime factors raised to their respective highest power, i.e. 2³ = 8.
Hence, the LCM of 4 and 8 by prime factorization is 8.

☛ Also Check:

• LCM of 16, 18 and 24 - 144
• LCM of 36 and 90 - 180
• LCM of 5 and 13 - 65
• LCM of 13 and 26 - 26
• LCM of 8 and 18 - 72
• LCM of 7 and 16 - 112
• LCM of 24, 36, 44 and 62 - 24552

FAQs on LCM of 4 and 8

What is the LCM of 4 and 8?

The LCM of 4 and 8 is 8. To find the LCM of 4 and 8, we need to find the multiples of 4 and 8 (multiples of 4 = 4, 8, 12, 16; multiples of 8 = 8, 16, 24, 32) and choose the smallest multiple that is exactly divisible by 4 and 8, i.e., 8.

If the LCM of 8 and 4 is 8, Find its GCF.

LCM(8, 4) × GCF(8, 4) = 8 × 4
Since the LCM of 8 and 4 = 8
⇒ 8 × GCF(8, 4) = 32
Therefore, the GCF = 32/8 = 4.

What are the Methods to Find LCM of 4 and 8?

The commonly used methods to find the LCM of 4 and 8 are:

• Prime Factorization Method
• Listing Multiples
• Division Method

How to Find the LCM of 4 and 8 by Prime Factorization?

To find the LCM of 4 and 8 using prime factorization, we will find the prime factors, (4 = 2 × 2) and (8 = 2 × 2 × 2). LCM of 4 and 8 is the product of prime factors raised to their respective highest exponent among the numbers 4 and 8.
⇒ LCM of 4, 8 = 2³ = 8.

What is the Least Perfect Square Divisible by 4 and 8?

The least number divisible by 4 and 8 = LCM(4, 8)
LCM of 4 and 8 = 2 × 2 × 2 [Incomplete pair(s): 2]
⇒ Least perfect square divisible by each 4 and 8 = LCM(4, 8) × 2 = 16 [Square root of 16 = √16 = ±4]
Therefore, 16 is the required number.