An array is made when items are arranged in rows and columns. This array has 12 counters. Every row in an array is the same length and every column in an array is the same length. This array has 4 ...

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, ...