Fast 15 Lcd

What is the fastest way to figure out what LCD these numbers have in common?
8, 12 and 15. I know that it is 120 but it took me forever to figure it out! I don't want to have to take forever if I have a question like this on my test tonight. Help please =)
With out using a calculator.
use prime factorization
8 = 2x2x2
12 = 2x2x3
15 = 3x5
we have 2;3 and 5
lets deal with 2 first. which row the number 2 repeat the most? first row, right?
so you have 2x2x2
lets deal with 3. Which row number 3 repeat the most? since the second row and the third row has number 3 repeat only once.
so you have:
2x2x2x3
lets deal with 5. which row the number 5 repeat the most? the third row. so you have:
2x2x2x3x5 = 120
well, that is the only way to find the LCM. i did it without using a calculator
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JSG Libertad - 15" LCD
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