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.