Least common denominators are the smallest denominator you can go without the numerator being a fraction or decimal. 12/20 can be defined as 6/10 or 3/5, depending on the problem.
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It means Lowest Common Denominator.
Least common denominator means the LCM (least common multiple) of the denominator of a set of fractions. However, here is only 1 number provided in the question, 72, and even then 72 is not a fraction. Therefore, there is no least common denominator for 72.
Impossible to answer - the word 'common' means you need to be comparing it to something else !
Note: numerator is the top part of the fraction, denominator is the bottom part. 1) Find a common denominator. It may be the least common denominator, but it need not be; just multiplying the denominators also gives you a common denominator, not necessarily the smallest one. 2) Convert each fraction so that it has this common denominator. This means multiplying numerator and denominator by the same number.
A few synonyms for common denominator are , common divisor, common measure, denominator, numerator