Multiplying three digit by one digit numbers
How to multiply a three digit number by a one digit number
(e.g. 159 * 7).
 Place one number above the other so that the ones'
place digits are lined up. Draw a line under the bottom number.
159
7
 Multiply the two ones' place digits (9 * 7 = 63). This number is larger
than 9, so place the six above the tens' place column and place the three below the
line in the ones' place column.
6
159
7
3
 Multiply the digit in the tens' place column (5) by the other number (7).
The result is 5 * 7 = 35. Add the 6 to the 35 which equals 41. Place the one from the
number 41 below the line and to the left of the other number. Place the 4 above the hundreds' place column.
46
159
7
13
 Multiply the digit in the hundreds' place column (1) by the digit in the ones'
place of the second number (7). The result is 1 * 7 = 7. Add the 4 to the 7
(4 + 7 = 11). Place this below the line and to the left of the other digits.
46
159
7
1113

