The LCM of 16 and 20 is 80.
The LCM is the product of the numbers divided by their GCF.
The GCF of 16 and 20 is 4. (We know the GCF can't be any larger than the difference between the two numbers. Trying 4 divided into 16 and 20 shows that it is a factor of both).
16 * 20 / 4 = 80, which is the LCM.
The LCM is: 80
Method of prime factorization: Expressing each number as the product of prime numbers.
20 = 2x2x5
16 = 2x2x2x2
H.C.F. of 20 and 16 = 2x2 = 4.
L.C.M.(20,16) = H.C.F.(20,16) x Product of uncommon numbers in prime factorizations
L.C.M.(20,16) = 4 x 5x2x2 = 4x20 = 80.
Alternate method:
Multiples of 20 are 20, 40, 60, 80, 100, 120, 140, 160, 180,...
Multiples of 16 are 16, 32, 48, 64, 80, 96, 112, 128, 144, 160,...
As we can see that there exists infinite common multiples but the least common multiple is 80.
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Least common multiple of 16 and 20 and 32 is 160.
The Least Common Multiple (LCM) for 16 20 is 80.
The Least Common Multiple (LCM) of3, 16, and 20 is 240.
240
80.