0.7 already is a real number, so you don't need to convert anything.
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7 = 07
You add an positive number to .07. The answer is greater than .07
The square of a real number is always a real number.
Yes, zero is a real number. It is not a counting number, but it is an integer, a rational number, and a real number.
Of course, not only can it be a real number but it is a real number. When you take the square root times itself, the result is a number that is real.