LCM of 10, 20, and 25
LCM of 10, 20, and 25 is the smallest number among all common multiples of 10, 20, and 25. The first few multiples of 10, 20, and 25 are (10, 20, 30, 40, 50 . . .), (20, 40, 60, 80, 100 . . .), and (25, 50, 75, 100, 125 . . .) respectively. There are 3 commonly used methods to find LCM of 10, 20, 25  by listing multiples, by prime factorization, and by division method.
1.  LCM of 10, 20, and 25 
2.  List of Methods 
3.  Solved Examples 
4.  FAQs 
What is the LCM of 10, 20, and 25?
Answer: LCM of 10, 20, and 25 is 100.
Explanation:
The LCM of three nonzero integers, a(10), b(20), and c(25), is the smallest positive integer m(100) that is divisible by a(10), b(20), and c(25) without any remainder.
Methods to Find LCM of 10, 20, and 25
Let's look at the different methods for finding the LCM of 10, 20, and 25.
 By Prime Factorization Method
 By Division Method
 By Listing Multiples
LCM of 10, 20, and 25 by Prime Factorization
Prime factorization of 10, 20, and 25 is (2 × 5) = 2^{1} × 5^{1}, (2 × 2 × 5) = 2^{2} × 5^{1}, and (5 × 5) = 5^{2} respectively. LCM of 10, 20, and 25 can be obtained by multiplying prime factors raised to their respective highest power, i.e. 2^{2} × 5^{2} = 100.
Hence, the LCM of 10, 20, and 25 by prime factorization is 100.
LCM of 10, 20, and 25 by Division Method
To calculate the LCM of 10, 20, and 25 by the division method, we will divide the numbers(10, 20, 25) by their prime factors (preferably common). The product of these divisors gives the LCM of 10, 20, and 25.
 Step 1: Find the smallest prime number that is a factor of at least one of the numbers, 10, 20, and 25. Write this prime number(2) on the left of the given numbers(10, 20, and 25), separated as per the ladder arrangement.
 Step 2: If any of the given numbers (10, 20, 25) 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 10, 20, and 25 is the product of all prime numbers on the left, i.e. LCM(10, 20, 25) by division method = 2 × 2 × 5 × 5 = 100.
LCM of 10, 20, and 25 by Listing Multiples
To calculate the LCM of 10, 20, 25 by listing out the common multiples, we can follow the given below steps:
 Step 1: List a few multiples of 10 (10, 20, 30, 40, 50 . . .), 20 (20, 40, 60, 80, 100 . . .), and 25 (25, 50, 75, 100, 125 . . .).
 Step 2: The common multiples from the multiples of 10, 20, and 25 are 100, 200, . . .
 Step 3: The smallest common multiple of 10, 20, and 25 is 100.
∴ The least common multiple of 10, 20, and 25 = 100.
ā Also Check:
 LCM of 72 and 108  216
 LCM of 30 and 42  210
 LCM of 4, 9 and 10  180
 LCM of 7 and 13  91
 LCM of 3 and 3  3
 LCM of 6, 7 and 8  168
 LCM of 8 and 30  120
LCM of 10, 20, and 25 Examples

Example 1: Verify the relationship between the GCD and LCM of 10, 20, and 25.
Solution:
The relation between GCD and LCM of 10, 20, and 25 is given as,
LCM(10, 20, 25) = [(10 × 20 × 25) × GCD(10, 20, 25)]/[GCD(10, 20) × GCD(20, 25) × GCD(10, 25)]
⇒ Prime factorization of 10, 20 and 25: 10 = 2^{1} × 5^{1}
 20 = 2^{2} × 5^{1}
 25 = 5^{2}
∴ GCD of (10, 20), (20, 25), (10, 25) and (10, 20, 25) = 10, 5, 5 and 5 respectively.
Now, LHS = LCM(10, 20, 25) = 100.
And, RHS = [(10 × 20 × 25) × GCD(10, 20, 25)]/[GCD(10, 20) × GCD(20, 25) × GCD(10, 25)] = [(5000) × 5]/[10 × 5 × 5] = 100
LHS = RHS = 100.
Hence verified. 
Example 2: Find the smallest number that is divisible by 10, 20, 25 exactly.
Solution:
The smallest number that is divisible by 10, 20, and 25 exactly is their LCM.
⇒ Multiples of 10, 20, and 25: Multiples of 10 = 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, . . . .
 Multiples of 20 = 20, 40, 60, 80, 100, 120, . . . .
 Multiples of 25 = 25, 50, 75, 100, 125, 150, . . . .
Therefore, the LCM of 10, 20, and 25 is 100.

Example 3: Calculate the LCM of 10, 20, and 25 using the GCD of the given numbers.
Solution:
Prime factorization of 10, 20, 25:
 10 = 2^{1} × 5^{1}
 20 = 2^{2} × 5^{1}
 25 = 5^{2}
Therefore, GCD(10, 20) = 10, GCD(20, 25) = 5, GCD(10, 25) = 5, GCD(10, 20, 25) = 5
We know,
LCM(10, 20, 25) = [(10 × 20 × 25) × GCD(10, 20, 25)]/[GCD(10, 20) × GCD(20, 25) × GCD(10, 25)]
LCM(10, 20, 25) = (5000 × 5)/(10 × 5 × 5) = 100
⇒LCM(10, 20, 25) = 100
FAQs on LCM of 10, 20, and 25
What is the LCM of 10, 20, and 25?
The LCM of 10, 20, and 25 is 100. To find the least common multiple (LCM) of 10, 20, and 25, we need to find the multiples of 10, 20, and 25 (multiples of 10 = 10, 20, 30, 40 . . . . 100 . . . . ; multiples of 20 = 20, 40, 60, 80 . . . . 100 . . . . ; multiples of 25 = 25, 50, 75, 100 . . . .) and choose the smallest multiple that is exactly divisible by 10, 20, and 25, i.e., 100.
What are the Methods to Find LCM of 10, 20, 25?
The commonly used methods to find the LCM of 10, 20, 25 are:
 Listing Multiples
 Prime Factorization Method
 Division Method
How to Find the LCM of 10, 20, and 25 by Prime Factorization?
To find the LCM of 10, 20, and 25 using prime factorization, we will find the prime factors, (10 = 2^{1} × 5^{1}), (20 = 2^{2} × 5^{1}), and (25 = 5^{2}). LCM of 10, 20, and 25 is the product of prime factors raised to their respective highest exponent among the numbers 10, 20, and 25.
⇒ LCM of 10, 20, 25 = 2^{2} × 5^{2} = 100.
What is the Relation Between GCF and LCM of 10, 20, 25?
The following equation can be used to express the relation between GCF and LCM of 10, 20, 25, i.e. LCM(10, 20, 25) = [(10 × 20 × 25) × GCF(10, 20, 25)]/[GCF(10, 20) × GCF(20, 25) × GCF(10, 25)].
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