Find the sum of the following numbers and verify the commutative law of addition.

$256, 479$

Find the sum of the following numbers and verify the commutative law of addition.

$6379, 12676$

Find the sum of the following numbers and verify the commutative law of addition.

$52974, 2765$

Find the sum of the following numbers, using the most convenient grouping:

$3719, 286, 5281$

Find the sum of the following numbers, using the most convenient grouping:

$1952, 357, 2448, 743$

Find the sum of the following numbers, using the associative property of addition:

$1841, 4477, 3459, 2673, 1223$

Find the following products and verify the commutative property of multiplication.

$126 \times 63$

Find the following products and verify the commutative property of multiplication.

$437\times 742$

Find the products using most convenient grouping.

$8\times 427\times 25$