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.