A number close to an exact number is called an estimate or a ballpark figure.
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estimate
an exact decimal must be with the number 0. in it or it is not exact.
There is no "exact". It is infinite.
A 12-digit number is called a trillion. In the International System of Numeration, each group of three digits is named based on powers of a thousand. Therefore, a 12-digit number would represent a quantity in the trillions.
Yes
Not necessarily.