Save guides, add subjects and pick up where you left off with your BBC account. Napier’s method of multiplication is a method used to multiply large numbers when you do not have a calculator. Draw a 2 ...

The array can be shown as 5 groups of 3 showing that 5 x 3 = 15. Or it could be shown as 3 groups of 5 showing that 3 x 5 = 15. This demonstrates that multiplication is commutative. Image caption, ...