When drive-ins were at the height of their popularity in the late 1950s, some 4,000 existed in the United States, but today there are less than one-quarter that many.
there are less than one-quarter that many
there are fewer than one-quarter as many
there are fewer than one-quarter of that amount
the number is less than one-quarter the amount
it is less than one-quarter of that amount
[*]AMOUNT - only used to describe objects that CAN'T be counted. For example: Bravery, charisma, and water
[*]NUMBER - used to describe objects that CAN be counted. For example: Cars in the parking lot, puppies in the pound, and zits on my pubescent face
[*]LESS - used to describe objects that can't be counted
[*]FEWER - used to describe objects that can be counted
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