Aligning numbers vertically: Align the numbers vertically by their decimal points for subtraction.83.9−0.584Make sure the numbers are properly aligned to avoid any calculation errors.
Adding zeros for matching decimal places: Add zeros to the number with fewer decimal places to match the number of decimal places in the other number.83.900−0.584This ensures that each place value lines up correctly for the subtraction.
Subtracting numbers column-wise: Subtract the numbers starting from the rightmost digit and moving to the left.83.900-0.584\underline{\hspace{3em}}83.316Subtract each column, borrowing from the next column to the left if necessary.