Not necessarily. The product of their denominators is a common denominator, but might not be the smallest. For instance, the LCD of one tenth and one twentieth is 20.
I was told the Lcd is 4 not 8 is that true
Because when you compare fractions with the same denominators, you do not have to find the least common denominator (LCM or LCD).
The LCD of two fractions is the same as the LCM of their denominators.
The LCD for fractions is the LCM (least common multiple) of all of the denominators.
There is always an LCD for a set of fractions, even if it's only the product of the denominators.
It is the LCD.
The LCM is used for integers, not fractions. If you're trying to add unlike fractions, take the LCM of the denominators (known in this case as the least common denominator, or LCD), convert the fractions and proceed.
When you are adding or subtracting fractions with unlike denominators, you need to find a least common denominator, or LCD. The process is the same as finding an LCM between two integers.
The LCD for these fractions is 48,620.
The LCM of these numbers is 198. (LCD is just the LCM of the denominators of fractions.)
Possible reasons: To add or subtract fractions, To compare fractions with different denominators.
The denominators are different, so find the equivalent fractions using the LCD , then add the fractions with the denominators.