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Place this "worm" on the 100 square and find the total of the four squares it covers. Keeping its head in the same place, what other totals can you make?

Napier's Bones

Age 7 to 11 Challenge Level:

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.