Less is the comparative form of little. It is used especially before uncountable nouns. Fewer is the comparative of few. It is used before plural nouns. For example:
Jeff drinks less alcohol than John.
I have fewer pairs of shoes than I used to have.
Examples for fewer / less
There were fewer days below freezing last winter.
I drank less water than she did.
I have less than an hour to do this work.
People these days are buying fewer newspapers.
I have less time to do this work.
Fewer than thirty children each year develop the disease.
I wear less makeup on weekdays.
He worked fewer hours than I did.
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Fewer / less exercises
There were _______ days below freezing last winter.
I drank _______ water than she did.
I have _______ than an hour to do this work.
People these days are buying _______ newspapers.
I have _______ time to do this work.
_______ than thirty children each year develop the disease.