LCM of 20 and 100

LCM of 20 and 100 is the smallest number among all common multiples of 20 and 100. The first few multiples of 20 and 100 are (20, 40, 60, 80, 100, 120, 140, . . . ) and (100, 200, 300, 400, 500, 600, . . . ) respectively. There are 3 commonly used methods to find LCM of 20 and 100 - by listing multiples, by division method, and by prime factorization.

Answer: LCM of 20 and 100 is 100.

Explanation:

The LCM of two non-zero integers, x(20) and y(100), is the smallest positive integer m(100) that is divisible by both x(20) and y(100) without any remainder.

The methods to find the LCM of 20 and 100 are explained below.

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

LCM of 20 and 100 by Listing Multiples

To calculate the LCM of 20 and 100 by listing out the common multiples, we can follow the given below steps:

• Step 1: List a few multiples of 20 (20, 40, 60, 80, 100, 120, 140, . . . ) and 100 (100, 200, 300, 400, 500, 600, . . . . )
• Step 2: The common multiples from the multiples of 20 and 100 are 100, 200, . . .
• Step 3: The smallest common multiple of 20 and 100 is 100.

∴ The least common multiple of 20 and 100 = 100.

LCM of 20 and 100 by Division Method

To calculate the LCM of 20 and 100 by the division method, we will divide the numbers(20, 100) by their prime factors (preferably common). The product of these divisors gives the LCM of 20 and 100.

• Step 1: Find the smallest prime number that is a factor of at least one of the numbers, 20 and 100. Write this prime number(2) on the left of the given numbers(20 and 100), separated as per the ladder arrangement.
• Step 2: If any of the given numbers (20, 100) 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 20 and 100 is the product of all prime numbers on the left, i.e. LCM(20, 100) by division method = 2 × 2 × 5 × 5 = 100.

LCM of 20 and 100 by Prime Factorization

Prime factorization of 20 and 100 is (2 × 2 × 5) = 2² × 5¹ and (2 × 2 × 5 × 5) = 2² × 5² respectively. LCM of 20 and 100 can be obtained by multiplying prime factors raised to their respective highest power, i.e. 2² × 5² = 100.
Hence, the LCM of 20 and 100 by prime factorization is 100.

☛ Also Check:

• LCM of 30 and 48 - 240
• LCM of 42 and 48 - 336
• LCM of 3, 6 and 12 - 12
• LCM of 72, 126 and 168 - 504
• LCM of 96 and 404 - 9696
• LCM of 8, 15 and 20 - 120
• LCM of 3 and 12 - 12

FAQs on LCM of 20 and 100

What is the LCM of 20 and 100?

The LCM of 20 and 100 is 100. To find the LCM of 20 and 100, we need to find the multiples of 20 and 100 (multiples of 20 = 20, 40, 60, 80 . . . . 100; multiples of 100 = 100, 200, 300, 400) and choose the smallest multiple that is exactly divisible by 20 and 100, i.e., 100.

What is the Least Perfect Square Divisible by 20 and 100?

The least number divisible by 20 and 100 = LCM(20, 100)
LCM of 20 and 100 = 2 × 2 × 5 × 5 [No incomplete pair]
⇒ Least perfect square divisible by each 20 and 100 = 100 [Square root of 100 = √100 = ±10]
Therefore, 100 is the required number.

Which of the following is the LCM of 20 and 100? 16, 40, 5, 100

The value of LCM of 20, 100 is the smallest common multiple of 20 and 100. The number satisfying the given condition is 100.

If the LCM of 100 and 20 is 100, Find its GCF.

LCM(100, 20) × GCF(100, 20) = 100 × 20
Since the LCM of 100 and 20 = 100
⇒ 100 × GCF(100, 20) = 2000
Therefore, the GCF (greatest common factor) = 2000/100 = 20.

What are the Methods to Find LCM of 20 and 100?

The commonly used methods to find the LCM of 20 and 100 are:

• Listing Multiples
• Division Method
• Prime Factorization Method