# Chapter 4 - Section 4.2 - Precision and Greatest Possible Error - Exercise - Page 166: 20

precision 1 km GPE 0.5 km

#### Work Step by Step

The position of the last significant digit (the tagged zero) is the ones place, so the precision is 1. The greatest possible error is half the precision. $GPE=0.5\times1=0.5$

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