Astudent used his place value chart to show a number. after the teacher instructed him to divide his number by100, the chart showed 28.003. what was the number he started off with?

In this case you would just multiply it since the teacher had him divide the number. If you multiply 28.003 by 100 the decimal would move over to places to the right and the number would be 2800.3

Google it that might work