least common denominator

The email appears to have been a relatively common attempt to gain personal information from a wide range of unwitting victims.
Was Sony Hit With a Second Hack?|Shane Harris|January 8, 2015|DAILY BEAST
The vaccine is delivered through a “carrier virus” that causes a common cold in chimpanzees but does not affect humans.
The Race for the Ebola Vaccine|Abby Haglage|January 7, 2015|DAILY BEAST
Another read: “We need leaders who will stand against Common Core.”
Rand Paul’s Passive-Aggressive Trolling Campaign|Olivia Nuzzi|January 6, 2015|DAILY BEAST
Finding the common bonds that help us realize that we have far more in common than that which separates us.
In 2015, Let’s Try for More Compassion|Gene Robinson|January 4, 2015|DAILY BEAST

At the time, screen quotas were far more common among film producing industries.
Propaganda, Protest, and Poisonous Vipers: The Cinema War in Korea|Rich Goldstein|December 30, 2014|DAILY BEAST
The Smooth Naked Horsetail is a common plant, specially by the sides of streams and pools.
How to Know the Ferns|S. Leonard Bastin
I would ask you to imagine it translated into every language, a common material of understanding throughout all the world.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
Our social life is aimless without it, we are a crowd without a common understanding.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells
Diplococci without capsules are common in the sputum, but have no special significance.
A Manual of Clinical Diagnosis|James Campbell Todd
He had discovered that the all-glorious boast of Spain was not exempt from the infirmities of common men.
The Pastor's Fire-side Vol. 3 of 4|Jane Porter

British Dictionary definitions for least common denominator

noun

another name for lowest common denominator

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012