For periods B, F, and G - commutative and associative properties

The commutative property of addition:

a + b = b + c

ex. -4 + 7 = 7 + (-4)

The commutative property of multiplication:

ab = ba

ex. -4(7) = 7(-4) (remember having two numbers right next to each other only separated by a parenthesis indicates multiplication)

The associative property of addition:

(a + b)+ c = a + (b + c)

ex. (1 + 4) + 7 = 1 + (4 + 7)

The associative property of multiplication:

(a x b) x c = a x (b x c)

ex. (5 x 6) x 8 = 5 x (6 x 8)