\[3,4,8\]
Method 1: By Listing Multiples
1
List the multiples of each number.
Multiples of 3
: 3, 6, 9, 12, 15, 18, 21, 24, ...
Multiples of 4
: 4, 8, 12, 16, 20, 24, ...
Multiples of 8
: 8, 16, 24, ...
2
Find the smallest number that is shared by all rows above. This is the LCM.
LCM = 2424

Method 2: By Prime Factors
1
List the prime factors of each number.
Prime Factors of 3
: 3
Prime Factors of 4
: 2, 2
Prime Factors of 8
: 2, 2, 2
2
Find the union of these primes.
2,2,2,32,2,2,3

3
Multiply these numbers: 2×2×2×3=242\times 2\times 2\times 3=24. This is the LCM.
LCM = 2424

Done
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