Example: 1/30 and 1/42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCD
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24: 2 * 2 * 2 * 3 30: 2 * 3 * 5 LCD is 2^3 * 3 * 5 = 120
Since 11 and 17 are both prime, you multiply them together to get the LCD which comes out to be 187.
Since 13 is prime and 18=2*3*3, the LCD would be 2*3*3*13, or 234
To find an LCD, you need to have at least two denominators.
They're all prime numbers; 1 is the lcd * * * * * Sorry about the ignorance that permeates WA. First, they are not all primes, since 4 = 2*2 Also, the above answer refers to the HCF, not the LCD. The correct answer is 84