\[4,6\]
Method 1: By Listing Multiples
1
List the multiples of each number.
Multiples of 4
: 4, 8, 12, ...
Multiples of 6
: 6, 12, ...
2
Find the smallest number that is shared by all rows above. This is the LCM.
LCM = 1212

Method 2: By Prime Factors
1
List the prime factors of each number.
Prime Factors of 4
: 2, 2
Prime Factors of 6
: 2, 3
2
Find the union of these primes.
2,2,32,2,3

3
Multiply these numbers: 2×2×3=122\times 2\times 3=12. This is the LCM.
LCM = 1212

Done
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