fewer vs less

Fewer modifies plural countable nouns, while less modifies singular uncountable nouns.

a smaller number of countable items

The express lane is reserved for customers with ten fewer items than usual.

a smaller amount of uncountable mass

Adding less sugar to your coffee is a simple way to reduce daily calories.

Watch out

There are less chairs in this classroom than we actually need.

There are fewer chairs in this classroom than we actually need.
I have fewer time to finish this project than I thought.

I have less time to finish this project than I thought.

Remember Fewer is for things you count; less is for things you measure.

Quick check

Fill the gap with one of the two options.

1.
There were people at the conference this year due to the travel strike.
2.
The new engine design produces significantly noise during takeoff and landing.