# What are all the properties of real numbers? (multiplication and addition please)

AnthonyBot | (Level 1) eNoter

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Sorry i forgot to add the source.

aruv | High School Teacher | (Level 2) Valedictorian

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Properties of real numbers with respct to addition and multiplication

(i) Closed

if a and b are real numbers then  a+b is also real number.

(ii) Commutative

if a and b are real number .

a+b=b+a

(iii)  Associative

if a ,b and c are real numbers then

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

(iv) Identity element  Zero

a is real number then

a+0=0+a=a

a is real number then there exist real number b such that

a+b=0

a=-b

i.e  b=-a

2. Multiplication

(i) Closed

if a and b are real numbers then  axb is also real number.

(ii) Commutative

if a and b are real number .

a x b=b x a

(iii)  Associative

if a ,b and c are real numbers then

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

(iv) Identity element  one

a is real number then

a x 1=1 x a=a

(v)  Multplicative inverse

a is real number then there exist real number b such that

a x b= 1

a=1/b

i.e  b=1 / a