Examples
The LCD of
is 36 because the least common multiple of 12 and 18 is 36. Likewise the LCD of
is 12. Using the LCD (or any multiple of it, such as the product of the denominators) as a denominator enables addition, subtraction or comparison of fractions:
The lowest common denominator of two vulgar fractions can be found by computing the least common multiple of their denominators.
Read more about this topic: Lowest Common Denominator
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“No rules exist, and examples are simply life-savers answering the appeals of rules making vain attempts to exist.”
—André Breton (1896–1966)
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—G.C. (Georg Christoph)