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:

Two strips of the 3 and 2 times table laid out next to each other.

To multiply this number by 7, add the numbers along the diagonals of the seventh line, starting at the right:

Adding the diagonals of the two strips.

So the answer is 224.

Here's another example, this time we are multiplying 746 by 6. Click on Napier to start the demo.

Think about the row of numbers you are looking at. Where have they come from?
How does the layout of the grid in Napier's bones help?
Compare Napier's bones to other ways you may write down multiplication sums.