You may also like

Prompt Cards

These two group activities use mathematical reasoning - one is numerical, one geometric.

Consecutive Numbers

An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

Exploring Wild & Wonderful Number Patterns

EWWNP means Exploring Wild and Wonderful Number Patterns Created by Yourself! Investigate what happens if we create number patterns using some simple rules.

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 .