fewer and less

Fewer is the comparative of few (used before plural nouns)
Less is the comparative of little (used before uncountable nouns which are singular)

  • few problems/ fewer problems
  • little money/ less money
  • I’ve got fewer problems than I used to have
  • I earn less money than a postman.

In informal English, some people use less with plural words

  • I’ve got less problems than I used to have.