Lesson One hundred and fourteen: Column Multiplication
Inspect this multiplication problem:
214
x 2
-----
428
The top digits are each multiplied by the bottom number. In this example,
the product of 4 x 2 goes in the ones column, the product of 2 x 1 goes
in the tens column, and the product of 2 x 2 goes in the hundreds column.
Here are a few more examples for you to study:
231 134 190
x 3 x 2 x 1
----- ----- -----
693 368 190