Line 1 to 2: Commutative Property of Multiplication, because all that changed was the order of the things being multiplied.
Line 2 to 3: Commutative Property of *Addition*, because all that changed was the order of the things being added.
All that changed in either step was the ordering of the things being multiplied or added. That’s the commutative property.
.08 cents per ounce, because 2.40 ÷30 =.08
You would do 6.4/1.6 because big should come first or the number will change
