Respuesta :
					                   9000 is the answer because 9x1= 9 and you just have to put all the zeros together which makes 9000
					                
					                
					             
					                   100×90=9000
an easy way to figure this out is multiply the 90 and 1 then add the two zeros from the 100 to the end.
					                
					             an easy way to figure this out is multiply the 90 and 1 then add the two zeros from the 100 to the end.
