In mathematics, the real numbers include both rational numbers, such as 24 and 32/154, and irrational numbers, such as pi and the square root of two; or, a real number can be given by
an infinite decimal representation, such as 7.66758768..., where the digits continue in a number of way or the real numbers may be consideration of as points on an infinitely long **number
line**. (Source Wikipedia).

Here we learn about the properties of positive real numbers :

If we add two real numbers that have the same sign, the result obtained will be a positive number.

In general, (positive number) + (positive number) = (positive number).

If we add two real numbers that have the different sign, the result obtained will be a negative number.

In general, (negative number) + (negative number) = (negative number).

The real numbers are structured by the well-known correlation “<” (less than).

¨ r < v means there is a positive real number t such that r + t = s.

"r > v means that v < r".

“r ≤ v means that whichever r < s or r = v. Fine point: This means that both the statements “55 ≤55” and “45 ≤98” are correct

”v ≥ r means that r ≤ v".

A real number r is whichever greater than 0 then it is positive, if equal to 0, or less than 0 then it is negative. As in the place of numbers, a few editors declare that r is positive if r ≥ 0.

If r and v are individual real numbers, then either r > v or r < v. This means the numbers are in completely ordered.

If r < v, the closed interval [r,v] is the set { x | r ≤ x ≤ v } and the open interval (r,v) is the set { r | r < x < v }.

1)Example for positive** **real numbers in addition:

Addition of 8.1 + 7.1= 8.1 (+) 7.1 = 15.2

Here, the sum of the values are 15.2 and their sign as same as positive (+) so answer is = 15.2.

2)Example for positive** **real numbers in subtraction:

Subtraction in 8.2 - (3.2)

8.2 - (3.2) = 5.0

Here the subtraction value is 5.0

3)Example for positive** **real numbers in multiplication:

Multiply -6.6 * - 6.6

-6.6 * -6.6 = (-1)(-1)43.56

= + 43.56

the answer is 43.56