How many How many is used to ask questions about the quantity of a countable noun . When asking how many? we always use the plural of the noun in the question: How many + countable noun + …?
Examples How many office s does the company have ? How many holiday s have you been on ? How many student s are hard workers ? How many language s do you speak ?
How much How much is used to ask questions about the quantity of an uncountable noun . When asking how much? we always use the singular of the noun in the question: How much + uncountable noun + …?
Examples How much space is on the computer ? How much money do I need for the holidays ? How much time will it take ? How much sugar does fruit contain ?