Multiplying three digit by one digit numbers

How to multiply a three digit number by a one digit number
(e.g. 312 * 3).

  • Place one number above the other so that the ones' place digits are lined up. Draw a line under the bottom number.
  • 
    312
      3
    
    
  • Multiply the two ones' place digits. (2 * 3 = 6). Place the six below the line in the ones' place column.
    
    312
      3
      6
    
  • Multiply the digit in the tens' place column (1) by the digit in the ones' place of the second number (3). The result is 1 * 3 = 3. Place the answer below the line and to the left of the 6.
    
    312
      3
     36
  • Multiply the digit in the hundreds' place column (3) by the second number (3). The result is 3 * 3 = 9. Place the 9 below the line in the hundreds' place column.
    
    312
      3
    936

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