How many is used is used to ask about quantities with countable nouns and how much asks about uncountable nouns.
How many is followed by a plural noun:
How many bottles of milk?
How many books?
How many people?
How many weeks?
How much is followed by an uncountable noun:
How much milk?
How much work?
How much money?
How much time?
It is common to use there are and there is with how many? and how much?. In questions: are there? and is there?
How many pens are there on the table?
How many chairs are there in the classroom?
How much ice-cream is there in the fridge?
How much pollution is there in Barcelona?
See much and many used in different ways...
Exercises on how much? and how many?...
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