Answer:
When you subtract 446 from 538 (538-446), you get 92. The reason why there is no digit in the hundreds place is because when you are trying to add a number to 446 so that it equals 538, that number is less than 100. It only goes out to the tens place (the farthest place in this case). Therefore, if the value of the hundreds place (in this case) equals 0, you just leave the digit in the hundreds place blank.
Hope this helped!