ok say you have 3/8 and 1/4 you find the least common multiple witch would be 8 so you go1/4x 2 is 2/8 so now you have 3/8 and2/8. tada!!
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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.
If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators. To add fractions with unlike denominators, rename the fractions with a common denominator.
There is none. A least common denominator is to be found between or among fractions. 3 and 7 are not fractions.
In mathematics, the lowest common denominator or least common denominator (abbreviated LCD) is the least common multiple of the denominators of a set of fractions. It simplifies adding, subtracting, and comparing fractions.
At least two fractions are needed to determine a least common denominator.