Astudent used his place value chart to show a number. after the teacher instructed him to divide his number by 100, the chart showed 7,342,800 draw a picture of what the place value chart looked like at first.

A student divided the given number by 100 that resulted to 28.003 in his chart. So what we are looking for this situation is the value of the number before it was divided by 100.
To get the value, simply multiply the result by 100
  28.003 x 100
=2800.3