It's essentially the same process as finding the least common multiple of whole numbers.
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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You Ned to find a larger common denominator or multiply the denominators to gain a common denominator.
Yes.
You first need to find a common denominator, not necessarily the least common denominator. Next, you rename the fractions according to the common denominator. Only then can you subtract the fractions. After subtraction you should simplify the answer.
It helps to find a common denominator and multiply both sides of the inequality by this common denominator. That way, you have an inequality without fractions.