LCM of 40, 36, and 126
LCM of 40, 36, and 126 is the smallest number among all common multiples of 40, 36, and 126. The first few multiples of 40, 36, and 126 are (40, 80, 120, 160, 200 . . .), (36, 72, 108, 144, 180 . . .), and (126, 252, 378, 504, 630 . . .) respectively. There are 3 commonly used methods to find LCM of 40, 36, 126  by listing multiples, by prime factorization, and by division method.
1.  LCM of 40, 36, and 126 
2.  List of Methods 
3.  Solved Examples 
4.  FAQs 
What is the LCM of 40, 36, and 126?
Answer: LCM of 40, 36, and 126 is 2520.
Explanation:
The LCM of three nonzero integers, a(40), b(36), and c(126), is the smallest positive integer m(2520) that is divisible by a(40), b(36), and c(126) without any remainder.
Methods to Find LCM of 40, 36, and 126
Let's look at the different methods for finding the LCM of 40, 36, and 126.
 By Prime Factorization Method
 By Division Method
 By Listing Multiples
LCM of 40, 36, and 126 by Prime Factorization
Prime factorization of 40, 36, and 126 is (2 × 2 × 2 × 5) = 2^{3} × 5^{1}, (2 × 2 × 3 × 3) = 2^{2} × 3^{2}, and (2 × 3 × 3 × 7) = 2^{1} × 3^{2} × 7^{1} respectively. LCM of 40, 36, and 126 can be obtained by multiplying prime factors raised to their respective highest power, i.e. 2^{3} × 3^{2} × 5^{1} × 7^{1} = 2520.
Hence, the LCM of 40, 36, and 126 by prime factorization is 2520.
LCM of 40, 36, and 126 by Division Method
To calculate the LCM of 40, 36, and 126 by the division method, we will divide the numbers(40, 36, 126) by their prime factors (preferably common). The product of these divisors gives the LCM of 40, 36, and 126.
 Step 1: Find the smallest prime number that is a factor of at least one of the numbers, 40, 36, and 126. Write this prime number(2) on the left of the given numbers(40, 36, and 126), separated as per the ladder arrangement.
 Step 2: If any of the given numbers (40, 36, 126) 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 40, 36, and 126 is the product of all prime numbers on the left, i.e. LCM(40, 36, 126) by division method = 2 × 2 × 2 × 3 × 3 × 5 × 7 = 2520.
LCM of 40, 36, and 126 by Listing Multiples
To calculate the LCM of 40, 36, 126 by listing out the common multiples, we can follow the given below steps:
 Step 1: List a few multiples of 40 (40, 80, 120, 160, 200 . . .), 36 (36, 72, 108, 144, 180 . . .), and 126 (126, 252, 378, 504, 630 . . .).
 Step 2: The common multiples from the multiples of 40, 36, and 126 are 2520, 5040, . . .
 Step 3: The smallest common multiple of 40, 36, and 126 is 2520.
∴ The least common multiple of 40, 36, and 126 = 2520.
ā Also Check:
 LCM of 16, 24 and 40  240
 LCM of 24, 36 and 48  144
 LCM of 30 and 90  90
 LCM of 16, 18 and 24  144
 LCM of 54 and 72  216
 LCM of 40 and 50  200
 LCM of 6 and 21  42
LCM of 40, 36, and 126 Examples

Example 1: Find the smallest number that is divisible by 40, 36, 126 exactly.
Solution:
The value of LCM(40, 36, 126) will be the smallest number that is exactly divisible by 40, 36, and 126.
⇒ Multiples of 40, 36, and 126: Multiples of 40 = 40, 80, 120, 160, 200, 240, 280, 320, 360, 400, . . . ., 2440, 2480, 2520, . . . .
 Multiples of 36 = 36, 72, 108, 144, 180, 216, 252, 288, 324, 360, . . . ., 2448, 2484, 2520, . . . .
 Multiples of 126 = 126, 252, 378, 504, 630, 756, 882, 1008, 1134, 1260, . . . ., 2142, 2268, 2394, 2520, . . . .
Therefore, the LCM of 40, 36, and 126 is 2520.

Example 2: Verify the relationship between the GCD and LCM of 40, 36, and 126.
Solution:
The relation between GCD and LCM of 40, 36, and 126 is given as,
LCM(40, 36, 126) = [(40 × 36 × 126) × GCD(40, 36, 126)]/[GCD(40, 36) × GCD(36, 126) × GCD(40, 126)]
⇒ Prime factorization of 40, 36 and 126: 40 = 2^{3} × 5^{1}
 36 = 2^{2} × 3^{2}
 126 = 2^{1} × 3^{2} × 7^{1}
∴ GCD of (40, 36), (36, 126), (40, 126) and (40, 36, 126) = 4, 18, 2 and 2 respectively.
Now, LHS = LCM(40, 36, 126) = 2520.
And, RHS = [(40 × 36 × 126) × GCD(40, 36, 126)]/[GCD(40, 36) × GCD(36, 126) × GCD(40, 126)] = [(181440) × 2]/[4 × 18 × 2] = 2520
LHS = RHS = 2520.
Hence verified. 
Example 3: Calculate the LCM of 40, 36, and 126 using the GCD of the given numbers.
Solution:
Prime factorization of 40, 36, 126:
 40 = 2^{3} × 5^{1}
 36 = 2^{2} × 3^{2}
 126 = 2^{1} × 3^{2} × 7^{1}
Therefore, GCD(40, 36) = 4, GCD(36, 126) = 18, GCD(40, 126) = 2, GCD(40, 36, 126) = 2
We know,
LCM(40, 36, 126) = [(40 × 36 × 126) × GCD(40, 36, 126)]/[GCD(40, 36) × GCD(36, 126) × GCD(40, 126)]
LCM(40, 36, 126) = (181440 × 2)/(4 × 18 × 2) = 2520
⇒LCM(40, 36, 126) = 2520
FAQs on LCM of 40, 36, and 126
What is the LCM of 40, 36, and 126?
The LCM of 40, 36, and 126 is 2520. To find the LCM (least common multiple) of 40, 36, and 126, we need to find the multiples of 40, 36, and 126 (multiples of 40 = 40, 80, 120, 160 . . . . 2520 . . . . ; multiples of 36 = 36, 72, 108, 144 . . . . 2520 . . . . ; multiples of 126 = 126, 252, 378, 504 . . . . 2520 . . . . ) and choose the smallest multiple that is exactly divisible by 40, 36, and 126, i.e., 2520.
Which of the following is the LCM of 40, 36, and 126? 2520, 18, 105, 30
The value of LCM of 40, 36, 126 is the smallest common multiple of 40, 36, and 126. The number satisfying the given condition is 2520.
What is the Least Perfect Square Divisible by 40, 36, and 126?
The least number divisible by 40, 36, and 126 = LCM(40, 36, 126)
LCM of 40, 36, and 126 = 2 × 2 × 2 × 3 × 3 × 5 × 7 [Incomplete pair(s): 2, 5, 7]
⇒ Least perfect square divisible by each 40, 36, and 126 = LCM(40, 36, 126) × 2 × 5 × 7 = 176400 [Square root of 176400 = √176400 = ±420]
Therefore, 176400 is the required number.
What is the Relation Between GCF and LCM of 40, 36, 126?
The following equation can be used to express the relation between GCF and LCM of 40, 36, 126, i.e. LCM(40, 36, 126) = [(40 × 36 × 126) × GCF(40, 36, 126)]/[GCF(40, 36) × GCF(36, 126) × GCF(40, 126)].
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