The LCD for fractions is the LCM (least common multiple) of all of the denominators.
For the first fraction, divide the give denominator into the LCD, take that result and multiply by the given numerator to create a new numerator for the LCD. Repeat for each fraction.
subtract? Find a common denominator (LCD is preferred). Convert each fraction to an equivalent fraction with the LCD. Add numerators, keep LCD as new denominator. Reduce the fraction.
Because when you compare fractions with the same denominators, you do not have to find the least common denominator (LCM or LCD).
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When multiplying fractions, it is not necessary to find the LCD first.
Once you find the LCD, convert the fractions to their equivalents and then you can add and/or subtract them correctly.
(1) find the LCD. (2) find the factor that each original denominator needs to be multiplied by to get the LCD. (3) multiply both the numerator and the denominator by that factor.
You need at least two fractions to find an LCD.
In order to find the LCD when adding or subtracting fractions
The LCD for fractions is the LCM (least common multiple) of all of the denominators.
Yes
You need at least two fractions to find a common denominator.
When reducing fractions to their lowest terms or finding the LCD of fractions
The LCD of two fractions is the same as the LCM of their denominators.
You need at least two fractions to find an LCD. If that's 5/7 and 1/2, the LCD is 14.
The same process can be used to find them. They're essentially the same thing, except the LCD is used with fractions.