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, ...

The grid method is a visual way of multiplying two numbers. Each digit in the number is put into its place value column. For example, calculate \(46 \times 35\): ...