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what is closure property ?
Real numbers are closed with respect to addition and multiplication.
This means: 
If you add or multiply real numbers the answer is also real.
Let's go through a couple of examples.

Closure Property of Real Number Addition 
The problem 3 + 6 = 9 demonstrates the closure property of real number addition.
Observe that the addends and the sum are real numbers.
The closure property of real number addition states that when we add real numbers to other real numbers the result is also real.
In the example above, 3, 6, and 9 are real numbers

Closure Property of Real Number Multiplication
The problem 5 x 8 = 40 demonstrates the closure property of real number multiplication.
Observe that the factors and the product are real numbers.
The closure property of real number multiplication states that when we multiply real numbers with other real numbers the result is also real.
In the example above, 5, 8, and 40 are real numbers.


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