Commutative law for multiplication
Turning the 3 × 5 array on its side illustrates that 3 × 5 = 5 × 3 because the 'area' does not change.
We can also see this by rotating the appropriate rectangle.
Turning the 3 × 5 array on its side illustrates that 3 × 5 = 5 × 3 because the 'area' does not change.
We can also see this by rotating the appropriate rectangle.