Few, little, much, and many are unique among quantifiers in that they have comparative and superlative forms, many of them irregular:
Here are some example sentences that illustrate these quantifiers:
We have made few mistakes.
We have made fewer mistakes than we did last quarter.
We have made the fewest mistakes of any comparable period.
In informal conversation, less is sometimes used instead of fewer, but this is only marginally acceptable. For example:
X? We have made less mistakes this year.
It was only a little money.
It was less money than we had expected.
It was the least money that we have ever earned.
It took many dollars to buy that.
It took more dollars than we had expected.
It took the most dollars of any transaction we have ever had.
We don’t have much money.
We have more money than they do.
We have the most money of any company.