What is one tenth of 2325

Describe all the numbers that when rounded to the nearest thousand are 645,000

Ineed if you could explain and give me the answer you! this needs done

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days