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Least Common Denominator

The smallest whole number that can be used as a denominator for two or more fractions. The least common denominator is the least common multiple of the original denominators.

 

Example:       What is the least common denominator for and ?
Answer:

can be written or or or etc.

can be written or or or etc.

This shows that the least common denominator is 24.

 


  this page updated 21-feb-16
Mathwords: Terms and Formulas from Algebra I to Calculus
written, illustrated, and webmastered by Bruce Simmons
NCTM Web Bytes December 2004 Web Bytes March 2005 Web Bytes