The accuracy of 8 thousand is 1 thousand, and its error is large. The accuracy of 8000 is 1, and the error is small.
The accuracy of multiplying 2.5 by the fourth power of 10 is different from that of 25000. The precision of multiplying 2.5 by the fourth power of ten is thousands, while the precision of 25000 is 1.
The accuracy of 30,300,3000 is 1.