What is the tenths digit in 23.578 worth? Multiply that digit by the column. Five in the tenths column is not worth 5. To name the digit only, use which digit is in this place?
What is the tenths digit worth?
digit × 0.1 = ?
Change the column and the multiplication changes with it. The answer is a value, such as 20 or 0.07, not a single digit.