That's the least common denominator, or LCD.
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The smallest number that each of the denominators will divide into evenly is called the least common multiple (LCM).
get the common dinominators and do what u did to the denominator to the numerator!. ex: if I had three fractions with different denominators then I would multiply the denominators till they are the same number then with the number I multiplied with on the bottom I would multiply on to the top!
The smallest number is 3
unlike denominators: the bottom number of a fraction. to have unlike denominators you must have two fractions with a different number on the bottom of each fraction.
in order to answer this problem you have to first make the denominators (bottom number) match.Do this by finding the smallest common multiple (the smallest number that both of the denominators divide into) of the denominators.3/4 - 1/23/4 - (1/2) x 2 (4 is the smallest common multiple of 2 and 4. Multiply 1/2 by 2 so that the denominators match)3/4 - 2/4 (now you just subtract the numerators (top number). leave the denominators as they are.)3/4 - 2/4 = 1/4