The way in which three numbers are grouped

when they are multiplied doesn't change the

product.

Example 2 (4 x 5) = 4 (5 x 2)

The way in which 3 numbers are grouped when they are

added doesn't change the sum

example ( 1 + 2 ) + 4 = 2 + ( 1 + 4 )

when they are multiplied doesn't change the

product.

Example 2 (4 x 5) = 4 (5 x 2)

The way in which 3 numbers are grouped when they are

added doesn't change the sum

example ( 1 + 2 ) + 4 = 2 + ( 1 + 4 )