3/5 and 3/20you need to find the LCM of 5 and 20
multiples of 5: 0,5,10,15,20
multiples of 20: 0,20,40,60,80
the LCM of thedenominators,5 and 20, is 20
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The LCD for fractions is the LCM (least common multiple) of all of the denominators.
No sure way.just list the factors and circle common ones
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).