Factor them.
2 x 2 x 3 = 12
2 x 2 x 2 x 2 x 2 = 32
Combine the factors, eliminating duplicates.
2 x 2 x 2 x 2 x 2 x 3 = 96, the LCD
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lcd(2, 6, 12) = 12.
224
224
The LCD for 8 and 10 is 40. To find it, list the multiples of both numbers. The first multiple that they have in common is the LCD.
You need at least two numbers to find an LCD. If that's 12 and 115, the LCD is 1380. If that's 121 and 15, the LCD is 1815.