Subtract 3-Digit Numbers: Learn

• Place one number above the other so that the hundreds', tens' and ones' places are lined up. Draw a line under the bottom number.

  	6	5	8
  -	4	7	2

• Subtract the digits in the ones' place column (8 - 2 = 6) and place the answer below the line in the ones' place column.

  	6	5	8
  -	4	7	2
  			6

• Subtract the numbers in the tens' place column (5 - 7 = ?). Since 7 is larger than 5, borrow one from the hundreds' place to make the top value larger than the bottom value. After this is done, subtract (15 - 7 = 8) and place the 8 below the line in the tens' place column.

  	5	15
  	6	5	8
  -	4	7	2
  		8	6

• Subtract the digits in the hundreds' place column (5 - 4 = 1) and place the answer below the line in the hundreds' place column.

  	5	15
  	6	5	8
  -	4	7	2
  	1	8	6