Using the anyorder property of multiplication
Together, the commutative and associative laws give the anyorder property of multiplication.
A list of whole numbers can be multiplied two at a time in any order to give the same result.
The anyorder property of multiplication can be used to simplify calculations by changing the order in which we perform multiplications. For example:

= (2 × 5) × (2 × 5) × (2 × 5) 
= 10 × 10 × 10  



Sometimes this reordering happens after we decompose one of the factors. For example:
 17 × 4 = (17 × 2) × 2 = 34 × 2 = 68
 36 × 5 = 18 × (2 × 5) = 180