16783 how many are there

How many… How many backpacks are there? There are _ backpacks are there? How many circles are there? There _ How many computers are there? There _ How many rectangles are there? There _ 10 How many pencil cases are there? There _ How many pencils are there? There is _ pencil How many books are there? There are _ books How many erasers are there? There is _ How many boys are there? There _ _ 11 How many students are there in your classroom? There _ How many notebooks are there? There _