Subtraction, division
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Try it out. 3 + 9 = 9 + 3 That works. 3 x 9 = 9 x 3 That works. 3 - 9 = 9 - 3 That doesn't work. 3/9 = 9/3 That doesn't work. The numbers came first. The commutative law was only devised because of the relationship of the numbers. It isn't that the commutative property doesn't work for other operations, it's that the other operations aren't commutative.
No, it does not.
Not sure what "would not work" in this case. The corresponding commutative property states that 5x4 is the same as 4x5.
it is the commutative property of addition
Yes. Both the commutative property of addition, and the commutative property of multiplication, works:* For integers * For rational numbers (i.e., fractions) * For any real numbers * For complex numbers