The table is split up into the nine columns. Here is how they're used:
For example, let's calculate 32 x 7 .
Lay out the two strips showing 3 and 2 at the top like this:
To multiply this number by 7, add the numbers along the diagonals of the seventh line, starting at the right:
So the answer is 224 .
Here's another example, this time we are multiplying 746 by 6. Click on Napier to start the demo.