Approximation has two meanings, approximation in quantity and time. Another meaning is possible, so there are synonyms such as probably, possibly, almost, about, maybe, about, etc.

Since it is approximate in quantity and time, it should be determined according to the mathematical approximate definition.

Mathematically, the definition of approximation is a number close to the standard, and rounding is the most commonly used method to find approximation.

According to the rounding method, 5000≈ 10000, 14999≈ 10000.

Therefore, the numerical range equal to about 10000 can be a number from 5000 to 14999.

Of course, according to the Chinese meaning of 10000, it should be at least between 9900 and 10999.