bmwhype2
The number of fish is (greater/more) than 100.
There are (more/greater) than 100 fish.
bmwhype2
does it matter whether the noun is countable?
I've compiled this list myself after LOTS of trial and error. I like to think of it from the fewer/less perspective than the greater/more perspective. two sides of the same coin.
Greater vs. More
Fewer vs. Less
Fewer refers to countable nouns.
Less is used in groups/subsets, fractions, money, periods of time and distance, distance and numerical data.
There are fewer pollutants and less of certain pollutants.
Group
Less than forty percent of Americans have a healthy muscle to fat ratio.
Fraction
Dallas is less than twenty miles away and less than five minutes away.
Distance & time
Dallas is less than six feet tall.
Numerical data
Danny always carries less than two dollars in his wallet.
Money
Brooklyn has a population of
less than five million and
fewer immigrants than ever before.
Brooklyn has a population of fewer than five million and less immigrants than ever before.