Which of the following is correct? I need fewer tables

I need less tables

Which of the following is correct? The street now has less trees

The street now has fewer trees

Which of the following is correct? Add more or fewer garlic to taste

Add more or less garlic to taste

Which of the following is correct? I've had fewer ideas lately

I've had less ideas lately

Which of the following is correct? Off-peak there are fewer accidents

Off-peak there are less accidents

Which of the following is correct? I had less friends than you

I had fewer friends than you

Which of the following is correct? Students could face fewer exams

Students could face less exams

Which of the following is correct? Less men are becoming teachers

Fewer men are becoming teachers

Which of the following is correct? The public has less cash to spend

The public has fewer cash to spend

Which of the following is correct? Less cars are on the road

Fewer cars are on the road