Take a example and check whether subtraction is commutative for whole numbers or not?

Take a few examples and check whether division is commutative for whole numbers or not?

Verify the following:

$(5\times 6)\times 2=5\times (6\times 2)$

Verify the following:

$(3\times 7)\times 5=3\times (7\times 5)$

Use the commutative and associative properties to simplify the following:

$319+69+81$

Use the commutative and associative properties to simplify the following:

$431+37+69+63$

Use the commutative and associative properties to simplify the following:

$2\times (71\times 5)$

Use the commutative and associative properties to simplify the following:

$50\times 17\times 2$