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You have asked too many questions at the same time. I have edited your question as you are allowed to ask only one question.
Some of the properties of real numbers are:
Commutative properties: This applies to addition and multiplication and states that for two real numbers a and b, a + b = b + a and a*b = b*a
Associative properties: This states that for three real numbers a, b and c, (a + b) + c = a + (b + c) and (a*b)*c = (a*(b*c)
Distributive property: This states that for three real numbers a, b and c, a*(b + c) = a*b + a*c
Density property: This states that for any two real numbers it is possible to find another real number that lies between the two. Put another way, there are an infinite number of real numbers.
Identity properties: For any number a, a + 0 = a, a is called the additive identity. Similarly for multiplication a*1 = a, 1 is the multiplicative identity.
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